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 enum qdisc_state2_t { 44 /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly. 45 * Use qdisc_run_begin/end() or qdisc_is_running() instead. 46 */ 47 __QDISC_STATE2_RUNNING, 48 }; 49 50 #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED) 51 #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING) 52 53 #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \ 54 QDISC_STATE_DRAINING) 55 56 struct qdisc_size_table { 57 struct rcu_head rcu; 58 struct list_head list; 59 struct tc_sizespec szopts; 60 int refcnt; 61 u16 data[]; 62 }; 63 64 /* similar to sk_buff_head, but skb->prev pointer is undefined. */ 65 struct qdisc_skb_head { 66 struct sk_buff *head; 67 struct sk_buff *tail; 68 __u32 qlen; 69 spinlock_t lock; 70 }; 71 72 struct Qdisc { 73 int (*enqueue)(struct sk_buff *skb, 74 struct Qdisc *sch, 75 struct sk_buff **to_free); 76 struct sk_buff * (*dequeue)(struct Qdisc *sch); 77 unsigned int flags; 78 #define TCQ_F_BUILTIN 1 79 #define TCQ_F_INGRESS 2 80 #define TCQ_F_CAN_BYPASS 4 81 #define TCQ_F_MQROOT 8 82 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for 83 * q->dev_queue : It can test 84 * netif_xmit_frozen_or_stopped() before 85 * dequeueing next packet. 86 * Its true for MQ/MQPRIO slaves, or non 87 * multiqueue device. 88 */ 89 #define TCQ_F_WARN_NONWC (1 << 16) 90 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ 91 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : 92 * qdisc_tree_decrease_qlen() should stop. 93 */ 94 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ 95 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ 96 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ 97 u32 limit; 98 const struct Qdisc_ops *ops; 99 struct qdisc_size_table __rcu *stab; 100 struct hlist_node hash; 101 u32 handle; 102 u32 parent; 103 104 struct netdev_queue *dev_queue; 105 106 struct net_rate_estimator __rcu *rate_est; 107 struct gnet_stats_basic_sync __percpu *cpu_bstats; 108 struct gnet_stats_queue __percpu *cpu_qstats; 109 int pad; 110 refcount_t refcnt; 111 112 /* 113 * For performance sake on SMP, we put highly modified fields at the end 114 */ 115 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; 116 struct qdisc_skb_head q; 117 struct gnet_stats_basic_sync bstats; 118 struct gnet_stats_queue qstats; 119 unsigned long state; 120 unsigned long state2; /* must be written under qdisc spinlock */ 121 struct Qdisc *next_sched; 122 struct sk_buff_head skb_bad_txq; 123 124 spinlock_t busylock ____cacheline_aligned_in_smp; 125 spinlock_t seqlock; 126 127 struct rcu_head rcu; 128 netdevice_tracker dev_tracker; 129 /* private data */ 130 long privdata[] ____cacheline_aligned; 131 }; 132 133 static inline void qdisc_refcount_inc(struct Qdisc *qdisc) 134 { 135 if (qdisc->flags & TCQ_F_BUILTIN) 136 return; 137 refcount_inc(&qdisc->refcnt); 138 } 139 140 static inline bool qdisc_refcount_dec_if_one(struct Qdisc *qdisc) 141 { 142 if (qdisc->flags & TCQ_F_BUILTIN) 143 return true; 144 return refcount_dec_if_one(&qdisc->refcnt); 145 } 146 147 /* Intended to be used by unlocked users, when concurrent qdisc release is 148 * possible. 149 */ 150 151 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) 152 { 153 if (qdisc->flags & TCQ_F_BUILTIN) 154 return qdisc; 155 if (refcount_inc_not_zero(&qdisc->refcnt)) 156 return qdisc; 157 return NULL; 158 } 159 160 /* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc 161 * root_lock section, or provide their own memory barriers -- ordering 162 * against qdisc_run_begin/end() atomic bit operations. 163 */ 164 static inline bool qdisc_is_running(struct Qdisc *qdisc) 165 { 166 if (qdisc->flags & TCQ_F_NOLOCK) 167 return spin_is_locked(&qdisc->seqlock); 168 return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); 169 } 170 171 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc) 172 { 173 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY); 174 } 175 176 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) 177 { 178 return q->flags & TCQ_F_CPUSTATS; 179 } 180 181 static inline bool qdisc_is_empty(const struct Qdisc *qdisc) 182 { 183 if (qdisc_is_percpu_stats(qdisc)) 184 return nolock_qdisc_is_empty(qdisc); 185 return !READ_ONCE(qdisc->q.qlen); 186 } 187 188 /* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with 189 * the qdisc root lock acquired. 190 */ 191 static inline bool qdisc_run_begin(struct Qdisc *qdisc) 192 { 193 if (qdisc->flags & TCQ_F_NOLOCK) { 194 if (spin_trylock(&qdisc->seqlock)) 195 return true; 196 197 /* No need to insist if the MISSED flag was already set. 198 * Note that test_and_set_bit() also gives us memory ordering 199 * guarantees wrt potential earlier enqueue() and below 200 * spin_trylock(), both of which are necessary to prevent races 201 */ 202 if (test_and_set_bit(__QDISC_STATE_MISSED, &qdisc->state)) 203 return false; 204 205 /* Try to take the lock again to make sure that we will either 206 * grab it or the CPU that still has it will see MISSED set 207 * when testing it in qdisc_run_end() 208 */ 209 return spin_trylock(&qdisc->seqlock); 210 } 211 return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); 212 } 213 214 static inline void qdisc_run_end(struct Qdisc *qdisc) 215 { 216 if (qdisc->flags & TCQ_F_NOLOCK) { 217 spin_unlock(&qdisc->seqlock); 218 219 /* spin_unlock() only has store-release semantic. The unlock 220 * and test_bit() ordering is a store-load ordering, so a full 221 * memory barrier is needed here. 222 */ 223 smp_mb(); 224 225 if (unlikely(test_bit(__QDISC_STATE_MISSED, 226 &qdisc->state))) 227 __netif_schedule(qdisc); 228 } else { 229 __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); 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 struct tcf_result { 328 union { 329 struct { 330 unsigned long class; 331 u32 classid; 332 }; 333 const struct tcf_proto *goto_tp; 334 }; 335 }; 336 337 struct tcf_chain; 338 339 struct tcf_proto_ops { 340 struct list_head head; 341 char kind[IFNAMSIZ]; 342 343 int (*classify)(struct sk_buff *, 344 const struct tcf_proto *, 345 struct tcf_result *); 346 int (*init)(struct tcf_proto*); 347 void (*destroy)(struct tcf_proto *tp, bool rtnl_held, 348 struct netlink_ext_ack *extack); 349 350 void* (*get)(struct tcf_proto*, u32 handle); 351 void (*put)(struct tcf_proto *tp, void *f); 352 int (*change)(struct net *net, struct sk_buff *, 353 struct tcf_proto*, unsigned long, 354 u32 handle, struct nlattr **, 355 void **, u32, 356 struct netlink_ext_ack *); 357 int (*delete)(struct tcf_proto *tp, void *arg, 358 bool *last, bool rtnl_held, 359 struct netlink_ext_ack *); 360 bool (*delete_empty)(struct tcf_proto *tp); 361 void (*walk)(struct tcf_proto *tp, 362 struct tcf_walker *arg, bool rtnl_held); 363 int (*reoffload)(struct tcf_proto *tp, bool add, 364 flow_setup_cb_t *cb, void *cb_priv, 365 struct netlink_ext_ack *extack); 366 void (*hw_add)(struct tcf_proto *tp, 367 void *type_data); 368 void (*hw_del)(struct tcf_proto *tp, 369 void *type_data); 370 void (*bind_class)(void *, u32, unsigned long, 371 void *, unsigned long); 372 void * (*tmplt_create)(struct net *net, 373 struct tcf_chain *chain, 374 struct nlattr **tca, 375 struct netlink_ext_ack *extack); 376 void (*tmplt_destroy)(void *tmplt_priv); 377 struct tcf_exts * (*get_exts)(const struct tcf_proto *tp, 378 u32 handle); 379 380 /* rtnetlink specific */ 381 int (*dump)(struct net*, struct tcf_proto*, void *, 382 struct sk_buff *skb, struct tcmsg*, 383 bool); 384 int (*terse_dump)(struct net *net, 385 struct tcf_proto *tp, void *fh, 386 struct sk_buff *skb, 387 struct tcmsg *t, bool rtnl_held); 388 int (*tmplt_dump)(struct sk_buff *skb, 389 struct net *net, 390 void *tmplt_priv); 391 392 struct module *owner; 393 int flags; 394 }; 395 396 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags 397 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race 398 * conditions can occur when filters are inserted/deleted simultaneously. 399 */ 400 enum tcf_proto_ops_flags { 401 TCF_PROTO_OPS_DOIT_UNLOCKED = 1, 402 }; 403 404 struct tcf_proto { 405 /* Fast access part */ 406 struct tcf_proto __rcu *next; 407 void __rcu *root; 408 409 /* called under RCU BH lock*/ 410 int (*classify)(struct sk_buff *, 411 const struct tcf_proto *, 412 struct tcf_result *); 413 __be16 protocol; 414 415 /* All the rest */ 416 u32 prio; 417 void *data; 418 const struct tcf_proto_ops *ops; 419 struct tcf_chain *chain; 420 /* Lock protects tcf_proto shared state and can be used by unlocked 421 * classifiers to protect their private data. 422 */ 423 spinlock_t lock; 424 bool deleting; 425 refcount_t refcnt; 426 struct rcu_head rcu; 427 struct hlist_node destroy_ht_node; 428 }; 429 430 struct qdisc_skb_cb { 431 struct { 432 unsigned int pkt_len; 433 u16 slave_dev_queue_mapping; 434 u16 tc_classid; 435 }; 436 #define QDISC_CB_PRIV_LEN 20 437 unsigned char data[QDISC_CB_PRIV_LEN]; 438 }; 439 440 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); 441 442 struct tcf_chain { 443 /* Protects filter_chain. */ 444 struct mutex filter_chain_lock; 445 struct tcf_proto __rcu *filter_chain; 446 struct list_head list; 447 struct tcf_block *block; 448 u32 index; /* chain index */ 449 unsigned int refcnt; 450 unsigned int action_refcnt; 451 bool explicitly_created; 452 bool flushing; 453 const struct tcf_proto_ops *tmplt_ops; 454 void *tmplt_priv; 455 struct rcu_head rcu; 456 }; 457 458 struct tcf_block { 459 /* Lock protects tcf_block and lifetime-management data of chains 460 * attached to the block (refcnt, action_refcnt, explicitly_created). 461 */ 462 struct mutex lock; 463 struct list_head chain_list; 464 u32 index; /* block index for shared blocks */ 465 u32 classid; /* which class this block belongs to */ 466 refcount_t refcnt; 467 struct net *net; 468 struct Qdisc *q; 469 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */ 470 struct flow_block flow_block; 471 struct list_head owner_list; 472 bool keep_dst; 473 atomic_t offloadcnt; /* Number of oddloaded filters */ 474 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ 475 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ 476 struct { 477 struct tcf_chain *chain; 478 struct list_head filter_chain_list; 479 } chain0; 480 struct rcu_head rcu; 481 DECLARE_HASHTABLE(proto_destroy_ht, 7); 482 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ 483 }; 484 485 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) 486 { 487 return lockdep_is_held(&chain->filter_chain_lock); 488 } 489 490 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) 491 { 492 return lockdep_is_held(&tp->lock); 493 } 494 495 #define tcf_chain_dereference(p, chain) \ 496 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) 497 498 #define tcf_proto_dereference(p, tp) \ 499 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) 500 501 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 502 { 503 struct qdisc_skb_cb *qcb; 504 505 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb)); 506 BUILD_BUG_ON(sizeof(qcb->data) < sz); 507 } 508 509 static inline int qdisc_qlen(const struct Qdisc *q) 510 { 511 return q->q.qlen; 512 } 513 514 static inline int qdisc_qlen_sum(const struct Qdisc *q) 515 { 516 __u32 qlen = q->qstats.qlen; 517 int i; 518 519 if (qdisc_is_percpu_stats(q)) { 520 for_each_possible_cpu(i) 521 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; 522 } else { 523 qlen += q->q.qlen; 524 } 525 526 return qlen; 527 } 528 529 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 530 { 531 return (struct qdisc_skb_cb *)skb->cb; 532 } 533 534 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 535 { 536 return &qdisc->q.lock; 537 } 538 539 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 540 { 541 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 542 543 return q; 544 } 545 546 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) 547 { 548 return rcu_dereference_bh(qdisc->dev_queue->qdisc); 549 } 550 551 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 552 { 553 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping); 554 } 555 556 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 557 { 558 struct Qdisc *root = qdisc_root_sleeping(qdisc); 559 560 ASSERT_RTNL(); 561 return qdisc_lock(root); 562 } 563 564 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 565 { 566 return qdisc->dev_queue->dev; 567 } 568 569 static inline void sch_tree_lock(struct Qdisc *q) 570 { 571 if (q->flags & TCQ_F_MQROOT) 572 spin_lock_bh(qdisc_lock(q)); 573 else 574 spin_lock_bh(qdisc_root_sleeping_lock(q)); 575 } 576 577 static inline void sch_tree_unlock(struct Qdisc *q) 578 { 579 if (q->flags & TCQ_F_MQROOT) 580 spin_unlock_bh(qdisc_lock(q)); 581 else 582 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 583 } 584 585 extern struct Qdisc noop_qdisc; 586 extern struct Qdisc_ops noop_qdisc_ops; 587 extern struct Qdisc_ops pfifo_fast_ops; 588 extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1]; 589 extern struct Qdisc_ops mq_qdisc_ops; 590 extern struct Qdisc_ops noqueue_qdisc_ops; 591 extern const struct Qdisc_ops *default_qdisc_ops; 592 static inline const struct Qdisc_ops * 593 get_default_qdisc_ops(const struct net_device *dev, int ntx) 594 { 595 return ntx < dev->real_num_tx_queues ? 596 default_qdisc_ops : &pfifo_fast_ops; 597 } 598 599 struct Qdisc_class_common { 600 u32 classid; 601 unsigned int filter_cnt; 602 struct hlist_node hnode; 603 }; 604 605 struct Qdisc_class_hash { 606 struct hlist_head *hash; 607 unsigned int hashsize; 608 unsigned int hashmask; 609 unsigned int hashelems; 610 }; 611 612 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 613 { 614 id ^= id >> 8; 615 id ^= id >> 4; 616 return id & mask; 617 } 618 619 static inline struct Qdisc_class_common * 620 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 621 { 622 struct Qdisc_class_common *cl; 623 unsigned int h; 624 625 if (!id) 626 return NULL; 627 628 h = qdisc_class_hash(id, hash->hashmask); 629 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 630 if (cl->classid == id) 631 return cl; 632 } 633 return NULL; 634 } 635 636 static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl) 637 { 638 return cl->filter_cnt > 0; 639 } 640 641 static inline void qdisc_class_get(struct Qdisc_class_common *cl) 642 { 643 unsigned int res; 644 645 if (check_add_overflow(cl->filter_cnt, 1, &res)) 646 WARN(1, "Qdisc class overflow"); 647 648 cl->filter_cnt = res; 649 } 650 651 static inline void qdisc_class_put(struct Qdisc_class_common *cl) 652 { 653 unsigned int res; 654 655 if (check_sub_overflow(cl->filter_cnt, 1, &res)) 656 WARN(1, "Qdisc class underflow"); 657 658 cl->filter_cnt = res; 659 } 660 661 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 662 { 663 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 664 665 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 666 } 667 668 int qdisc_class_hash_init(struct Qdisc_class_hash *); 669 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 670 struct Qdisc_class_common *); 671 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 672 struct Qdisc_class_common *); 673 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 674 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 675 676 int dev_qdisc_change_tx_queue_len(struct net_device *dev); 677 void dev_qdisc_change_real_num_tx(struct net_device *dev, 678 unsigned int new_real_tx); 679 void dev_init_scheduler(struct net_device *dev); 680 void dev_shutdown(struct net_device *dev); 681 void dev_activate(struct net_device *dev); 682 void dev_deactivate(struct net_device *dev); 683 void dev_deactivate_many(struct list_head *head); 684 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 685 struct Qdisc *qdisc); 686 void qdisc_reset(struct Qdisc *qdisc); 687 void qdisc_destroy(struct Qdisc *qdisc); 688 void qdisc_put(struct Qdisc *qdisc); 689 void qdisc_put_unlocked(struct Qdisc *qdisc); 690 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); 691 #ifdef CONFIG_NET_SCHED 692 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 693 void *type_data); 694 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 695 struct Qdisc *new, struct Qdisc *old, 696 enum tc_setup_type type, void *type_data, 697 struct netlink_ext_ack *extack); 698 #else 699 static inline int 700 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 701 void *type_data) 702 { 703 q->flags &= ~TCQ_F_OFFLOADED; 704 return 0; 705 } 706 707 static inline void 708 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 709 struct Qdisc *new, struct Qdisc *old, 710 enum tc_setup_type type, void *type_data, 711 struct netlink_ext_ack *extack) 712 { 713 } 714 #endif 715 void qdisc_offload_query_caps(struct net_device *dev, 716 enum tc_setup_type type, 717 void *caps, size_t caps_len); 718 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 719 const struct Qdisc_ops *ops, 720 struct netlink_ext_ack *extack); 721 void qdisc_free(struct Qdisc *qdisc); 722 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 723 const struct Qdisc_ops *ops, u32 parentid, 724 struct netlink_ext_ack *extack); 725 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 726 const struct qdisc_size_table *stab); 727 int skb_do_redirect(struct sk_buff *); 728 729 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 730 { 731 #ifdef CONFIG_NET_XGRESS 732 return skb->tc_at_ingress; 733 #else 734 return false; 735 #endif 736 } 737 738 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 739 { 740 #ifdef CONFIG_NET_CLS_ACT 741 if (skb->tc_skip_classify) { 742 skb->tc_skip_classify = 0; 743 return true; 744 } 745 #endif 746 return false; 747 } 748 749 /* Reset all TX qdiscs greater than index of a device. */ 750 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 751 { 752 struct Qdisc *qdisc; 753 754 for (; i < dev->num_tx_queues; i++) { 755 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 756 if (qdisc) { 757 spin_lock_bh(qdisc_lock(qdisc)); 758 qdisc_reset(qdisc); 759 spin_unlock_bh(qdisc_lock(qdisc)); 760 } 761 } 762 } 763 764 /* Are all TX queues of the device empty? */ 765 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 766 { 767 unsigned int i; 768 769 rcu_read_lock(); 770 for (i = 0; i < dev->num_tx_queues; i++) { 771 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 772 const struct Qdisc *q = rcu_dereference(txq->qdisc); 773 774 if (!qdisc_is_empty(q)) { 775 rcu_read_unlock(); 776 return false; 777 } 778 } 779 rcu_read_unlock(); 780 return true; 781 } 782 783 /* Are any of the TX qdiscs changing? */ 784 static inline bool qdisc_tx_changing(const struct net_device *dev) 785 { 786 unsigned int i; 787 788 for (i = 0; i < dev->num_tx_queues; i++) { 789 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 790 791 if (rcu_access_pointer(txq->qdisc) != 792 rcu_access_pointer(txq->qdisc_sleeping)) 793 return true; 794 } 795 return false; 796 } 797 798 /* Is the device using the noop qdisc on all queues? */ 799 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 800 { 801 unsigned int i; 802 803 for (i = 0; i < dev->num_tx_queues; i++) { 804 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 805 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 806 return false; 807 } 808 return true; 809 } 810 811 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 812 { 813 return qdisc_skb_cb(skb)->pkt_len; 814 } 815 816 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 817 enum net_xmit_qdisc_t { 818 __NET_XMIT_STOLEN = 0x00010000, 819 __NET_XMIT_BYPASS = 0x00020000, 820 }; 821 822 #ifdef CONFIG_NET_CLS_ACT 823 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 824 #else 825 #define net_xmit_drop_count(e) (1) 826 #endif 827 828 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 829 const struct Qdisc *sch) 830 { 831 #ifdef CONFIG_NET_SCHED 832 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 833 834 if (stab) 835 __qdisc_calculate_pkt_len(skb, stab); 836 #endif 837 } 838 839 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 840 struct sk_buff **to_free) 841 { 842 qdisc_calculate_pkt_len(skb, sch); 843 return sch->enqueue(skb, sch, to_free); 844 } 845 846 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats, 847 __u64 bytes, __u32 packets) 848 { 849 u64_stats_update_begin(&bstats->syncp); 850 u64_stats_add(&bstats->bytes, bytes); 851 u64_stats_add(&bstats->packets, packets); 852 u64_stats_update_end(&bstats->syncp); 853 } 854 855 static inline void bstats_update(struct gnet_stats_basic_sync *bstats, 856 const struct sk_buff *skb) 857 { 858 _bstats_update(bstats, 859 qdisc_pkt_len(skb), 860 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); 861 } 862 863 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 864 const struct sk_buff *skb) 865 { 866 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb); 867 } 868 869 static inline void qdisc_bstats_update(struct Qdisc *sch, 870 const struct sk_buff *skb) 871 { 872 bstats_update(&sch->bstats, skb); 873 } 874 875 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 876 const struct sk_buff *skb) 877 { 878 sch->qstats.backlog -= qdisc_pkt_len(skb); 879 } 880 881 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 882 const struct sk_buff *skb) 883 { 884 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 885 } 886 887 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 888 const struct sk_buff *skb) 889 { 890 sch->qstats.backlog += qdisc_pkt_len(skb); 891 } 892 893 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 894 const struct sk_buff *skb) 895 { 896 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 897 } 898 899 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 900 { 901 this_cpu_inc(sch->cpu_qstats->qlen); 902 } 903 904 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 905 { 906 this_cpu_dec(sch->cpu_qstats->qlen); 907 } 908 909 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 910 { 911 this_cpu_inc(sch->cpu_qstats->requeues); 912 } 913 914 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 915 { 916 sch->qstats.drops += count; 917 } 918 919 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 920 { 921 qstats->drops++; 922 } 923 924 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 925 { 926 qstats->overlimits++; 927 } 928 929 static inline void qdisc_qstats_drop(struct Qdisc *sch) 930 { 931 qstats_drop_inc(&sch->qstats); 932 } 933 934 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 935 { 936 this_cpu_inc(sch->cpu_qstats->drops); 937 } 938 939 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 940 { 941 sch->qstats.overlimits++; 942 } 943 944 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) 945 { 946 __u32 qlen = qdisc_qlen_sum(sch); 947 948 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); 949 } 950 951 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, 952 __u32 *backlog) 953 { 954 struct gnet_stats_queue qstats = { 0 }; 955 956 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats); 957 *qlen = qstats.qlen + qdisc_qlen(sch); 958 *backlog = qstats.backlog; 959 } 960 961 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch) 962 { 963 __u32 qlen, backlog; 964 965 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 966 qdisc_tree_reduce_backlog(sch, qlen, backlog); 967 } 968 969 static inline void qdisc_purge_queue(struct Qdisc *sch) 970 { 971 __u32 qlen, backlog; 972 973 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 974 qdisc_reset(sch); 975 qdisc_tree_reduce_backlog(sch, qlen, backlog); 976 } 977 978 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 979 struct qdisc_skb_head *qh) 980 { 981 struct sk_buff *last = qh->tail; 982 983 if (last) { 984 skb->next = NULL; 985 last->next = skb; 986 qh->tail = skb; 987 } else { 988 qh->tail = skb; 989 qh->head = skb; 990 } 991 qh->qlen++; 992 } 993 994 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 995 { 996 __qdisc_enqueue_tail(skb, &sch->q); 997 qdisc_qstats_backlog_inc(sch, skb); 998 return NET_XMIT_SUCCESS; 999 } 1000 1001 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 1002 struct qdisc_skb_head *qh) 1003 { 1004 skb->next = qh->head; 1005 1006 if (!qh->head) 1007 qh->tail = skb; 1008 qh->head = skb; 1009 qh->qlen++; 1010 } 1011 1012 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 1013 { 1014 struct sk_buff *skb = qh->head; 1015 1016 if (likely(skb != NULL)) { 1017 qh->head = skb->next; 1018 qh->qlen--; 1019 if (qh->head == NULL) 1020 qh->tail = NULL; 1021 skb->next = NULL; 1022 } 1023 1024 return skb; 1025 } 1026 1027 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 1028 { 1029 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 1030 1031 if (likely(skb != NULL)) { 1032 qdisc_qstats_backlog_dec(sch, skb); 1033 qdisc_bstats_update(sch, skb); 1034 } 1035 1036 return skb; 1037 } 1038 1039 struct tc_skb_cb { 1040 struct qdisc_skb_cb qdisc_cb; 1041 u32 drop_reason; 1042 1043 u16 zone; /* Only valid if post_ct = true */ 1044 u16 mru; 1045 u8 post_ct:1; 1046 u8 post_ct_snat:1; 1047 u8 post_ct_dnat:1; 1048 }; 1049 1050 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) 1051 { 1052 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; 1053 1054 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); 1055 return cb; 1056 } 1057 1058 static inline enum skb_drop_reason 1059 tcf_get_drop_reason(const struct sk_buff *skb) 1060 { 1061 return tc_skb_cb(skb)->drop_reason; 1062 } 1063 1064 static inline void tcf_set_drop_reason(const struct sk_buff *skb, 1065 enum skb_drop_reason reason) 1066 { 1067 tc_skb_cb(skb)->drop_reason = reason; 1068 } 1069 1070 /* Instead of calling kfree_skb() while root qdisc lock is held, 1071 * queue the skb for future freeing at end of __dev_xmit_skb() 1072 */ 1073 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 1074 { 1075 skb->next = *to_free; 1076 *to_free = skb; 1077 } 1078 1079 static inline void __qdisc_drop_all(struct sk_buff *skb, 1080 struct sk_buff **to_free) 1081 { 1082 if (skb->prev) 1083 skb->prev->next = *to_free; 1084 else 1085 skb->next = *to_free; 1086 *to_free = skb; 1087 } 1088 1089 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1090 struct qdisc_skb_head *qh, 1091 struct sk_buff **to_free) 1092 { 1093 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1094 1095 if (likely(skb != NULL)) { 1096 unsigned int len = qdisc_pkt_len(skb); 1097 1098 qdisc_qstats_backlog_dec(sch, skb); 1099 __qdisc_drop(skb, to_free); 1100 return len; 1101 } 1102 1103 return 0; 1104 } 1105 1106 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1107 { 1108 const struct qdisc_skb_head *qh = &sch->q; 1109 1110 return qh->head; 1111 } 1112 1113 /* generic pseudo peek method for non-work-conserving qdisc */ 1114 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1115 { 1116 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1117 1118 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1119 if (!skb) { 1120 skb = sch->dequeue(sch); 1121 1122 if (skb) { 1123 __skb_queue_head(&sch->gso_skb, skb); 1124 /* it's still part of the queue */ 1125 qdisc_qstats_backlog_inc(sch, skb); 1126 sch->q.qlen++; 1127 } 1128 } 1129 1130 return skb; 1131 } 1132 1133 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, 1134 struct sk_buff *skb) 1135 { 1136 if (qdisc_is_percpu_stats(sch)) { 1137 qdisc_qstats_cpu_backlog_dec(sch, skb); 1138 qdisc_bstats_cpu_update(sch, skb); 1139 qdisc_qstats_cpu_qlen_dec(sch); 1140 } else { 1141 qdisc_qstats_backlog_dec(sch, skb); 1142 qdisc_bstats_update(sch, skb); 1143 sch->q.qlen--; 1144 } 1145 } 1146 1147 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, 1148 unsigned int pkt_len) 1149 { 1150 if (qdisc_is_percpu_stats(sch)) { 1151 qdisc_qstats_cpu_qlen_inc(sch); 1152 this_cpu_add(sch->cpu_qstats->backlog, pkt_len); 1153 } else { 1154 sch->qstats.backlog += pkt_len; 1155 sch->q.qlen++; 1156 } 1157 } 1158 1159 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1160 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1161 { 1162 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1163 1164 if (skb) { 1165 skb = __skb_dequeue(&sch->gso_skb); 1166 if (qdisc_is_percpu_stats(sch)) { 1167 qdisc_qstats_cpu_backlog_dec(sch, skb); 1168 qdisc_qstats_cpu_qlen_dec(sch); 1169 } else { 1170 qdisc_qstats_backlog_dec(sch, skb); 1171 sch->q.qlen--; 1172 } 1173 } else { 1174 skb = sch->dequeue(sch); 1175 } 1176 1177 return skb; 1178 } 1179 1180 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1181 { 1182 /* 1183 * We do not know the backlog in bytes of this list, it 1184 * is up to the caller to correct it 1185 */ 1186 ASSERT_RTNL(); 1187 if (qh->qlen) { 1188 rtnl_kfree_skbs(qh->head, qh->tail); 1189 1190 qh->head = NULL; 1191 qh->tail = NULL; 1192 qh->qlen = 0; 1193 } 1194 } 1195 1196 static inline void qdisc_reset_queue(struct Qdisc *sch) 1197 { 1198 __qdisc_reset_queue(&sch->q); 1199 } 1200 1201 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1202 struct Qdisc **pold) 1203 { 1204 struct Qdisc *old; 1205 1206 sch_tree_lock(sch); 1207 old = *pold; 1208 *pold = new; 1209 if (old != NULL) 1210 qdisc_purge_queue(old); 1211 sch_tree_unlock(sch); 1212 1213 return old; 1214 } 1215 1216 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1217 { 1218 rtnl_kfree_skbs(skb, skb); 1219 qdisc_qstats_drop(sch); 1220 } 1221 1222 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1223 struct sk_buff **to_free) 1224 { 1225 __qdisc_drop(skb, to_free); 1226 qdisc_qstats_cpu_drop(sch); 1227 1228 return NET_XMIT_DROP; 1229 } 1230 1231 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1232 struct sk_buff **to_free) 1233 { 1234 __qdisc_drop(skb, to_free); 1235 qdisc_qstats_drop(sch); 1236 1237 return NET_XMIT_DROP; 1238 } 1239 1240 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1241 struct sk_buff **to_free) 1242 { 1243 __qdisc_drop_all(skb, to_free); 1244 qdisc_qstats_drop(sch); 1245 1246 return NET_XMIT_DROP; 1247 } 1248 1249 struct psched_ratecfg { 1250 u64 rate_bytes_ps; /* bytes per second */ 1251 u32 mult; 1252 u16 overhead; 1253 u16 mpu; 1254 u8 linklayer; 1255 u8 shift; 1256 }; 1257 1258 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1259 unsigned int len) 1260 { 1261 len += r->overhead; 1262 1263 if (len < r->mpu) 1264 len = r->mpu; 1265 1266 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1267 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1268 1269 return ((u64)len * r->mult) >> r->shift; 1270 } 1271 1272 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1273 const struct tc_ratespec *conf, 1274 u64 rate64); 1275 1276 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1277 const struct psched_ratecfg *r) 1278 { 1279 memset(res, 0, sizeof(*res)); 1280 1281 /* legacy struct tc_ratespec has a 32bit @rate field 1282 * Qdisc using 64bit rate should add new attributes 1283 * in order to maintain compatibility. 1284 */ 1285 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1286 1287 res->overhead = r->overhead; 1288 res->mpu = r->mpu; 1289 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 1290 } 1291 1292 struct psched_pktrate { 1293 u64 rate_pkts_ps; /* packets per second */ 1294 u32 mult; 1295 u8 shift; 1296 }; 1297 1298 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r, 1299 unsigned int pkt_num) 1300 { 1301 return ((u64)pkt_num * r->mult) >> r->shift; 1302 } 1303 1304 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64); 1305 1306 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 1307 * The fast path only needs to access filter list and to update stats 1308 */ 1309 struct mini_Qdisc { 1310 struct tcf_proto *filter_list; 1311 struct tcf_block *block; 1312 struct gnet_stats_basic_sync __percpu *cpu_bstats; 1313 struct gnet_stats_queue __percpu *cpu_qstats; 1314 unsigned long rcu_state; 1315 }; 1316 1317 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1318 const struct sk_buff *skb) 1319 { 1320 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb); 1321 } 1322 1323 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 1324 { 1325 this_cpu_inc(miniq->cpu_qstats->drops); 1326 } 1327 1328 struct mini_Qdisc_pair { 1329 struct mini_Qdisc miniq1; 1330 struct mini_Qdisc miniq2; 1331 struct mini_Qdisc __rcu **p_miniq; 1332 }; 1333 1334 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1335 struct tcf_proto *tp_head); 1336 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1337 struct mini_Qdisc __rcu **p_miniq); 1338 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, 1339 struct tcf_block *block); 1340 1341 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx); 1342 1343 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 1344 1345 /* Make sure qdisc is no longer in SCHED state. */ 1346 static inline void qdisc_synchronize(const struct Qdisc *q) 1347 { 1348 while (test_bit(__QDISC_STATE_SCHED, &q->state)) 1349 msleep(1); 1350 } 1351 1352 #endif 1353