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 #include <linux/xarray.h> 23 24 struct Qdisc_ops; 25 struct qdisc_walker; 26 struct tcf_walker; 27 struct module; 28 struct bpf_flow_keys; 29 30 struct qdisc_rate_table { 31 struct tc_ratespec rate; 32 u32 data[256]; 33 struct qdisc_rate_table *next; 34 int refcnt; 35 }; 36 37 enum qdisc_state_t { 38 __QDISC_STATE_SCHED, 39 __QDISC_STATE_DEACTIVATED, 40 __QDISC_STATE_MISSED, 41 __QDISC_STATE_DRAINING, 42 }; 43 44 enum qdisc_state2_t { 45 /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly. 46 * Use qdisc_run_begin/end() or qdisc_is_running() instead. 47 */ 48 __QDISC_STATE2_RUNNING, 49 }; 50 51 #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED) 52 #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING) 53 54 #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \ 55 QDISC_STATE_DRAINING) 56 57 struct qdisc_size_table { 58 struct rcu_head rcu; 59 struct list_head list; 60 struct tc_sizespec szopts; 61 int refcnt; 62 u16 data[]; 63 }; 64 65 /* similar to sk_buff_head, but skb->prev pointer is undefined. */ 66 struct qdisc_skb_head { 67 struct sk_buff *head; 68 struct sk_buff *tail; 69 __u32 qlen; 70 spinlock_t lock; 71 }; 72 73 struct Qdisc { 74 int (*enqueue)(struct sk_buff *skb, 75 struct Qdisc *sch, 76 struct sk_buff **to_free); 77 struct sk_buff * (*dequeue)(struct Qdisc *sch); 78 unsigned int flags; 79 #define TCQ_F_BUILTIN 1 80 #define TCQ_F_INGRESS 2 81 #define TCQ_F_CAN_BYPASS 4 82 #define TCQ_F_MQROOT 8 83 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for 84 * q->dev_queue : It can test 85 * netif_xmit_frozen_or_stopped() before 86 * dequeueing next packet. 87 * Its true for MQ/MQPRIO slaves, or non 88 * multiqueue device. 89 */ 90 #define TCQ_F_WARN_NONWC (1 << 16) 91 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ 92 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : 93 * qdisc_tree_decrease_qlen() should stop. 94 */ 95 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ 96 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ 97 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ 98 u32 limit; 99 const struct Qdisc_ops *ops; 100 struct qdisc_size_table __rcu *stab; 101 struct hlist_node hash; 102 u32 handle; 103 u32 parent; 104 105 struct netdev_queue *dev_queue; 106 107 struct net_rate_estimator __rcu *rate_est; 108 struct gnet_stats_basic_sync __percpu *cpu_bstats; 109 struct gnet_stats_queue __percpu *cpu_qstats; 110 int pad; 111 refcount_t refcnt; 112 113 /* 114 * For performance sake on SMP, we put highly modified fields at the end 115 */ 116 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; 117 struct qdisc_skb_head q; 118 struct gnet_stats_basic_sync bstats; 119 struct gnet_stats_queue qstats; 120 unsigned long state; 121 unsigned long state2; /* must be written under qdisc spinlock */ 122 struct Qdisc *next_sched; 123 struct sk_buff_head skb_bad_txq; 124 125 spinlock_t busylock ____cacheline_aligned_in_smp; 126 spinlock_t seqlock; 127 128 struct rcu_head rcu; 129 netdevice_tracker dev_tracker; 130 /* private data */ 131 long privdata[] ____cacheline_aligned; 132 }; 133 134 static inline void qdisc_refcount_inc(struct Qdisc *qdisc) 135 { 136 if (qdisc->flags & TCQ_F_BUILTIN) 137 return; 138 refcount_inc(&qdisc->refcnt); 139 } 140 141 static inline bool qdisc_refcount_dec_if_one(struct Qdisc *qdisc) 142 { 143 if (qdisc->flags & TCQ_F_BUILTIN) 144 return true; 145 return refcount_dec_if_one(&qdisc->refcnt); 146 } 147 148 /* Intended to be used by unlocked users, when concurrent qdisc release is 149 * possible. 150 */ 151 152 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) 153 { 154 if (qdisc->flags & TCQ_F_BUILTIN) 155 return qdisc; 156 if (refcount_inc_not_zero(&qdisc->refcnt)) 157 return qdisc; 158 return NULL; 159 } 160 161 /* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc 162 * root_lock section, or provide their own memory barriers -- ordering 163 * against qdisc_run_begin/end() atomic bit operations. 164 */ 165 static inline bool qdisc_is_running(struct Qdisc *qdisc) 166 { 167 if (qdisc->flags & TCQ_F_NOLOCK) 168 return spin_is_locked(&qdisc->seqlock); 169 return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); 170 } 171 172 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc) 173 { 174 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY); 175 } 176 177 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) 178 { 179 return q->flags & TCQ_F_CPUSTATS; 180 } 181 182 static inline bool qdisc_is_empty(const struct Qdisc *qdisc) 183 { 184 if (qdisc_is_percpu_stats(qdisc)) 185 return nolock_qdisc_is_empty(qdisc); 186 return !READ_ONCE(qdisc->q.qlen); 187 } 188 189 /* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with 190 * the qdisc root lock acquired. 191 */ 192 static inline bool qdisc_run_begin(struct Qdisc *qdisc) 193 { 194 if (qdisc->flags & TCQ_F_NOLOCK) { 195 if (spin_trylock(&qdisc->seqlock)) 196 return true; 197 198 /* No need to insist if the MISSED flag was already set. 199 * Note that test_and_set_bit() also gives us memory ordering 200 * guarantees wrt potential earlier enqueue() and below 201 * spin_trylock(), both of which are necessary to prevent races 202 */ 203 if (test_and_set_bit(__QDISC_STATE_MISSED, &qdisc->state)) 204 return false; 205 206 /* Try to take the lock again to make sure that we will either 207 * grab it or the CPU that still has it will see MISSED set 208 * when testing it in qdisc_run_end() 209 */ 210 return spin_trylock(&qdisc->seqlock); 211 } 212 return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); 213 } 214 215 static inline void qdisc_run_end(struct Qdisc *qdisc) 216 { 217 if (qdisc->flags & TCQ_F_NOLOCK) { 218 spin_unlock(&qdisc->seqlock); 219 220 /* spin_unlock() only has store-release semantic. The unlock 221 * and test_bit() ordering is a store-load ordering, so a full 222 * memory barrier is needed here. 223 */ 224 smp_mb(); 225 226 if (unlikely(test_bit(__QDISC_STATE_MISSED, 227 &qdisc->state))) 228 __netif_schedule(qdisc); 229 } else { 230 __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); 231 } 232 } 233 234 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) 235 { 236 return qdisc->flags & TCQ_F_ONETXQUEUE; 237 } 238 239 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) 240 { 241 #ifdef CONFIG_BQL 242 /* Non-BQL migrated drivers will return 0, too. */ 243 return dql_avail(&txq->dql); 244 #else 245 return 0; 246 #endif 247 } 248 249 struct Qdisc_class_ops { 250 unsigned int flags; 251 /* Child qdisc manipulation */ 252 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); 253 int (*graft)(struct Qdisc *, unsigned long cl, 254 struct Qdisc *, struct Qdisc **, 255 struct netlink_ext_ack *extack); 256 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); 257 void (*qlen_notify)(struct Qdisc *, unsigned long); 258 259 /* Class manipulation routines */ 260 unsigned long (*find)(struct Qdisc *, u32 classid); 261 int (*change)(struct Qdisc *, u32, u32, 262 struct nlattr **, unsigned long *, 263 struct netlink_ext_ack *); 264 int (*delete)(struct Qdisc *, unsigned long, 265 struct netlink_ext_ack *); 266 void (*walk)(struct Qdisc *, struct qdisc_walker * arg); 267 268 /* Filter manipulation */ 269 struct tcf_block * (*tcf_block)(struct Qdisc *sch, 270 unsigned long arg, 271 struct netlink_ext_ack *extack); 272 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, 273 u32 classid); 274 void (*unbind_tcf)(struct Qdisc *, unsigned long); 275 276 /* rtnetlink specific */ 277 int (*dump)(struct Qdisc *, unsigned long, 278 struct sk_buff *skb, struct tcmsg*); 279 int (*dump_stats)(struct Qdisc *, unsigned long, 280 struct gnet_dump *); 281 }; 282 283 /* Qdisc_class_ops flag values */ 284 285 /* Implements API that doesn't require rtnl lock */ 286 enum qdisc_class_ops_flags { 287 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, 288 }; 289 290 struct Qdisc_ops { 291 struct Qdisc_ops *next; 292 const struct Qdisc_class_ops *cl_ops; 293 char id[IFNAMSIZ]; 294 int priv_size; 295 unsigned int static_flags; 296 297 int (*enqueue)(struct sk_buff *skb, 298 struct Qdisc *sch, 299 struct sk_buff **to_free); 300 struct sk_buff * (*dequeue)(struct Qdisc *); 301 struct sk_buff * (*peek)(struct Qdisc *); 302 303 int (*init)(struct Qdisc *sch, struct nlattr *arg, 304 struct netlink_ext_ack *extack); 305 void (*reset)(struct Qdisc *); 306 void (*destroy)(struct Qdisc *); 307 int (*change)(struct Qdisc *sch, 308 struct nlattr *arg, 309 struct netlink_ext_ack *extack); 310 void (*attach)(struct Qdisc *sch); 311 int (*change_tx_queue_len)(struct Qdisc *, unsigned int); 312 void (*change_real_num_tx)(struct Qdisc *sch, 313 unsigned int new_real_tx); 314 315 int (*dump)(struct Qdisc *, struct sk_buff *); 316 int (*dump_stats)(struct Qdisc *, struct gnet_dump *); 317 318 void (*ingress_block_set)(struct Qdisc *sch, 319 u32 block_index); 320 void (*egress_block_set)(struct Qdisc *sch, 321 u32 block_index); 322 u32 (*ingress_block_get)(struct Qdisc *sch); 323 u32 (*egress_block_get)(struct Qdisc *sch); 324 325 struct module *owner; 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 }; 337 338 struct tcf_chain; 339 340 struct tcf_proto_ops { 341 struct list_head head; 342 char kind[IFNAMSIZ]; 343 344 int (*classify)(struct sk_buff *, 345 const struct tcf_proto *, 346 struct tcf_result *); 347 int (*init)(struct tcf_proto*); 348 void (*destroy)(struct tcf_proto *tp, bool rtnl_held, 349 struct netlink_ext_ack *extack); 350 351 void* (*get)(struct tcf_proto*, u32 handle); 352 void (*put)(struct tcf_proto *tp, void *f); 353 int (*change)(struct net *net, struct sk_buff *, 354 struct tcf_proto*, unsigned long, 355 u32 handle, struct nlattr **, 356 void **, u32, 357 struct netlink_ext_ack *); 358 int (*delete)(struct tcf_proto *tp, void *arg, 359 bool *last, bool rtnl_held, 360 struct netlink_ext_ack *); 361 bool (*delete_empty)(struct tcf_proto *tp); 362 void (*walk)(struct tcf_proto *tp, 363 struct tcf_walker *arg, bool rtnl_held); 364 int (*reoffload)(struct tcf_proto *tp, bool add, 365 flow_setup_cb_t *cb, void *cb_priv, 366 struct netlink_ext_ack *extack); 367 void (*hw_add)(struct tcf_proto *tp, 368 void *type_data); 369 void (*hw_del)(struct tcf_proto *tp, 370 void *type_data); 371 void (*bind_class)(void *, u32, unsigned long, 372 void *, unsigned long); 373 void * (*tmplt_create)(struct net *net, 374 struct tcf_chain *chain, 375 struct nlattr **tca, 376 struct netlink_ext_ack *extack); 377 void (*tmplt_destroy)(void *tmplt_priv); 378 struct tcf_exts * (*get_exts)(const struct tcf_proto *tp, 379 u32 handle); 380 381 /* rtnetlink specific */ 382 int (*dump)(struct net*, struct tcf_proto*, void *, 383 struct sk_buff *skb, struct tcmsg*, 384 bool); 385 int (*terse_dump)(struct net *net, 386 struct tcf_proto *tp, void *fh, 387 struct sk_buff *skb, 388 struct tcmsg *t, bool rtnl_held); 389 int (*tmplt_dump)(struct sk_buff *skb, 390 struct net *net, 391 void *tmplt_priv); 392 393 struct module *owner; 394 int flags; 395 }; 396 397 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags 398 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race 399 * conditions can occur when filters are inserted/deleted simultaneously. 400 */ 401 enum tcf_proto_ops_flags { 402 TCF_PROTO_OPS_DOIT_UNLOCKED = 1, 403 }; 404 405 struct tcf_proto { 406 /* Fast access part */ 407 struct tcf_proto __rcu *next; 408 void __rcu *root; 409 410 /* called under RCU BH lock*/ 411 int (*classify)(struct sk_buff *, 412 const struct tcf_proto *, 413 struct tcf_result *); 414 __be16 protocol; 415 416 /* All the rest */ 417 u32 prio; 418 void *data; 419 const struct tcf_proto_ops *ops; 420 struct tcf_chain *chain; 421 /* Lock protects tcf_proto shared state and can be used by unlocked 422 * classifiers to protect their private data. 423 */ 424 spinlock_t lock; 425 bool deleting; 426 refcount_t refcnt; 427 struct rcu_head rcu; 428 struct hlist_node destroy_ht_node; 429 }; 430 431 struct qdisc_skb_cb { 432 struct { 433 unsigned int pkt_len; 434 u16 slave_dev_queue_mapping; 435 u16 tc_classid; 436 }; 437 #define QDISC_CB_PRIV_LEN 20 438 unsigned char data[QDISC_CB_PRIV_LEN]; 439 }; 440 441 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); 442 443 struct tcf_chain { 444 /* Protects filter_chain. */ 445 struct mutex filter_chain_lock; 446 struct tcf_proto __rcu *filter_chain; 447 struct list_head list; 448 struct tcf_block *block; 449 u32 index; /* chain index */ 450 unsigned int refcnt; 451 unsigned int action_refcnt; 452 bool explicitly_created; 453 bool flushing; 454 const struct tcf_proto_ops *tmplt_ops; 455 void *tmplt_priv; 456 struct rcu_head rcu; 457 }; 458 459 struct tcf_block { 460 struct xarray ports; /* datapath accessible */ 461 /* Lock protects tcf_block and lifetime-management data of chains 462 * attached to the block (refcnt, action_refcnt, explicitly_created). 463 */ 464 struct mutex lock; 465 struct list_head chain_list; 466 u32 index; /* block index for shared blocks */ 467 u32 classid; /* which class this block belongs to */ 468 refcount_t refcnt; 469 struct net *net; 470 struct Qdisc *q; 471 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */ 472 struct flow_block flow_block; 473 struct list_head owner_list; 474 bool keep_dst; 475 atomic_t offloadcnt; /* Number of oddloaded filters */ 476 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ 477 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ 478 struct { 479 struct tcf_chain *chain; 480 struct list_head filter_chain_list; 481 } chain0; 482 struct rcu_head rcu; 483 DECLARE_HASHTABLE(proto_destroy_ht, 7); 484 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ 485 }; 486 487 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) 488 { 489 return lockdep_is_held(&chain->filter_chain_lock); 490 } 491 492 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) 493 { 494 return lockdep_is_held(&tp->lock); 495 } 496 497 #define tcf_chain_dereference(p, chain) \ 498 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) 499 500 #define tcf_proto_dereference(p, tp) \ 501 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) 502 503 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 504 { 505 struct qdisc_skb_cb *qcb; 506 507 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb)); 508 BUILD_BUG_ON(sizeof(qcb->data) < sz); 509 } 510 511 static inline int qdisc_qlen(const struct Qdisc *q) 512 { 513 return q->q.qlen; 514 } 515 516 static inline int qdisc_qlen_sum(const struct Qdisc *q) 517 { 518 __u32 qlen = q->qstats.qlen; 519 int i; 520 521 if (qdisc_is_percpu_stats(q)) { 522 for_each_possible_cpu(i) 523 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; 524 } else { 525 qlen += q->q.qlen; 526 } 527 528 return qlen; 529 } 530 531 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 532 { 533 return (struct qdisc_skb_cb *)skb->cb; 534 } 535 536 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 537 { 538 return &qdisc->q.lock; 539 } 540 541 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 542 { 543 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 544 545 return q; 546 } 547 548 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) 549 { 550 return rcu_dereference_bh(qdisc->dev_queue->qdisc); 551 } 552 553 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 554 { 555 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping); 556 } 557 558 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 559 { 560 struct Qdisc *root = qdisc_root_sleeping(qdisc); 561 562 ASSERT_RTNL(); 563 return qdisc_lock(root); 564 } 565 566 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 567 { 568 return qdisc->dev_queue->dev; 569 } 570 571 static inline void sch_tree_lock(struct Qdisc *q) 572 { 573 if (q->flags & TCQ_F_MQROOT) 574 spin_lock_bh(qdisc_lock(q)); 575 else 576 spin_lock_bh(qdisc_root_sleeping_lock(q)); 577 } 578 579 static inline void sch_tree_unlock(struct Qdisc *q) 580 { 581 if (q->flags & TCQ_F_MQROOT) 582 spin_unlock_bh(qdisc_lock(q)); 583 else 584 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 585 } 586 587 extern struct Qdisc noop_qdisc; 588 extern struct Qdisc_ops noop_qdisc_ops; 589 extern struct Qdisc_ops pfifo_fast_ops; 590 extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1]; 591 extern struct Qdisc_ops mq_qdisc_ops; 592 extern struct Qdisc_ops noqueue_qdisc_ops; 593 extern const struct Qdisc_ops *default_qdisc_ops; 594 static inline const struct Qdisc_ops * 595 get_default_qdisc_ops(const struct net_device *dev, int ntx) 596 { 597 return ntx < dev->real_num_tx_queues ? 598 default_qdisc_ops : &pfifo_fast_ops; 599 } 600 601 struct Qdisc_class_common { 602 u32 classid; 603 unsigned int filter_cnt; 604 struct hlist_node hnode; 605 }; 606 607 struct Qdisc_class_hash { 608 struct hlist_head *hash; 609 unsigned int hashsize; 610 unsigned int hashmask; 611 unsigned int hashelems; 612 }; 613 614 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 615 { 616 id ^= id >> 8; 617 id ^= id >> 4; 618 return id & mask; 619 } 620 621 static inline struct Qdisc_class_common * 622 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 623 { 624 struct Qdisc_class_common *cl; 625 unsigned int h; 626 627 if (!id) 628 return NULL; 629 630 h = qdisc_class_hash(id, hash->hashmask); 631 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 632 if (cl->classid == id) 633 return cl; 634 } 635 return NULL; 636 } 637 638 static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl) 639 { 640 return cl->filter_cnt > 0; 641 } 642 643 static inline void qdisc_class_get(struct Qdisc_class_common *cl) 644 { 645 unsigned int res; 646 647 if (check_add_overflow(cl->filter_cnt, 1, &res)) 648 WARN(1, "Qdisc class overflow"); 649 650 cl->filter_cnt = res; 651 } 652 653 static inline void qdisc_class_put(struct Qdisc_class_common *cl) 654 { 655 unsigned int res; 656 657 if (check_sub_overflow(cl->filter_cnt, 1, &res)) 658 WARN(1, "Qdisc class underflow"); 659 660 cl->filter_cnt = res; 661 } 662 663 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 664 { 665 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 666 667 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 668 } 669 670 int qdisc_class_hash_init(struct Qdisc_class_hash *); 671 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 672 struct Qdisc_class_common *); 673 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 674 struct Qdisc_class_common *); 675 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 676 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 677 678 int dev_qdisc_change_tx_queue_len(struct net_device *dev); 679 void dev_qdisc_change_real_num_tx(struct net_device *dev, 680 unsigned int new_real_tx); 681 void dev_init_scheduler(struct net_device *dev); 682 void dev_shutdown(struct net_device *dev); 683 void dev_activate(struct net_device *dev); 684 void dev_deactivate(struct net_device *dev); 685 void dev_deactivate_many(struct list_head *head); 686 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 687 struct Qdisc *qdisc); 688 void qdisc_reset(struct Qdisc *qdisc); 689 void qdisc_destroy(struct Qdisc *qdisc); 690 void qdisc_put(struct Qdisc *qdisc); 691 void qdisc_put_unlocked(struct Qdisc *qdisc); 692 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); 693 #ifdef CONFIG_NET_SCHED 694 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 695 void *type_data); 696 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 697 struct Qdisc *new, struct Qdisc *old, 698 enum tc_setup_type type, void *type_data, 699 struct netlink_ext_ack *extack); 700 #else 701 static inline int 702 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 703 void *type_data) 704 { 705 q->flags &= ~TCQ_F_OFFLOADED; 706 return 0; 707 } 708 709 static inline void 710 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 711 struct Qdisc *new, struct Qdisc *old, 712 enum tc_setup_type type, void *type_data, 713 struct netlink_ext_ack *extack) 714 { 715 } 716 #endif 717 void qdisc_offload_query_caps(struct net_device *dev, 718 enum tc_setup_type type, 719 void *caps, size_t caps_len); 720 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 721 const struct Qdisc_ops *ops, 722 struct netlink_ext_ack *extack); 723 void qdisc_free(struct Qdisc *qdisc); 724 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 725 const struct Qdisc_ops *ops, u32 parentid, 726 struct netlink_ext_ack *extack); 727 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 728 const struct qdisc_size_table *stab); 729 int skb_do_redirect(struct sk_buff *); 730 731 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 732 { 733 #ifdef CONFIG_NET_XGRESS 734 return skb->tc_at_ingress; 735 #else 736 return false; 737 #endif 738 } 739 740 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 741 { 742 #ifdef CONFIG_NET_CLS_ACT 743 if (skb->tc_skip_classify) { 744 skb->tc_skip_classify = 0; 745 return true; 746 } 747 #endif 748 return false; 749 } 750 751 /* Reset all TX qdiscs greater than index of a device. */ 752 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 753 { 754 struct Qdisc *qdisc; 755 756 for (; i < dev->num_tx_queues; i++) { 757 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 758 if (qdisc) { 759 spin_lock_bh(qdisc_lock(qdisc)); 760 qdisc_reset(qdisc); 761 spin_unlock_bh(qdisc_lock(qdisc)); 762 } 763 } 764 } 765 766 /* Are all TX queues of the device empty? */ 767 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 768 { 769 unsigned int i; 770 771 rcu_read_lock(); 772 for (i = 0; i < dev->num_tx_queues; i++) { 773 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 774 const struct Qdisc *q = rcu_dereference(txq->qdisc); 775 776 if (!qdisc_is_empty(q)) { 777 rcu_read_unlock(); 778 return false; 779 } 780 } 781 rcu_read_unlock(); 782 return true; 783 } 784 785 /* Are any of the TX qdiscs changing? */ 786 static inline bool qdisc_tx_changing(const struct net_device *dev) 787 { 788 unsigned int i; 789 790 for (i = 0; i < dev->num_tx_queues; i++) { 791 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 792 793 if (rcu_access_pointer(txq->qdisc) != 794 rcu_access_pointer(txq->qdisc_sleeping)) 795 return true; 796 } 797 return false; 798 } 799 800 /* Is the device using the noop qdisc on all queues? */ 801 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 802 { 803 unsigned int i; 804 805 for (i = 0; i < dev->num_tx_queues; i++) { 806 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 807 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 808 return false; 809 } 810 return true; 811 } 812 813 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 814 { 815 return qdisc_skb_cb(skb)->pkt_len; 816 } 817 818 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 819 enum net_xmit_qdisc_t { 820 __NET_XMIT_STOLEN = 0x00010000, 821 __NET_XMIT_BYPASS = 0x00020000, 822 }; 823 824 #ifdef CONFIG_NET_CLS_ACT 825 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 826 #else 827 #define net_xmit_drop_count(e) (1) 828 #endif 829 830 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 831 const struct Qdisc *sch) 832 { 833 #ifdef CONFIG_NET_SCHED 834 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 835 836 if (stab) 837 __qdisc_calculate_pkt_len(skb, stab); 838 #endif 839 } 840 841 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 842 struct sk_buff **to_free) 843 { 844 qdisc_calculate_pkt_len(skb, sch); 845 return sch->enqueue(skb, sch, to_free); 846 } 847 848 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats, 849 __u64 bytes, __u32 packets) 850 { 851 u64_stats_update_begin(&bstats->syncp); 852 u64_stats_add(&bstats->bytes, bytes); 853 u64_stats_add(&bstats->packets, packets); 854 u64_stats_update_end(&bstats->syncp); 855 } 856 857 static inline void bstats_update(struct gnet_stats_basic_sync *bstats, 858 const struct sk_buff *skb) 859 { 860 _bstats_update(bstats, 861 qdisc_pkt_len(skb), 862 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); 863 } 864 865 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 866 const struct sk_buff *skb) 867 { 868 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb); 869 } 870 871 static inline void qdisc_bstats_update(struct Qdisc *sch, 872 const struct sk_buff *skb) 873 { 874 bstats_update(&sch->bstats, skb); 875 } 876 877 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 878 const struct sk_buff *skb) 879 { 880 sch->qstats.backlog -= qdisc_pkt_len(skb); 881 } 882 883 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 884 const struct sk_buff *skb) 885 { 886 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 887 } 888 889 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 890 const struct sk_buff *skb) 891 { 892 sch->qstats.backlog += qdisc_pkt_len(skb); 893 } 894 895 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 896 const struct sk_buff *skb) 897 { 898 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 899 } 900 901 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 902 { 903 this_cpu_inc(sch->cpu_qstats->qlen); 904 } 905 906 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 907 { 908 this_cpu_dec(sch->cpu_qstats->qlen); 909 } 910 911 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 912 { 913 this_cpu_inc(sch->cpu_qstats->requeues); 914 } 915 916 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 917 { 918 sch->qstats.drops += count; 919 } 920 921 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 922 { 923 qstats->drops++; 924 } 925 926 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 927 { 928 qstats->overlimits++; 929 } 930 931 static inline void qdisc_qstats_drop(struct Qdisc *sch) 932 { 933 qstats_drop_inc(&sch->qstats); 934 } 935 936 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 937 { 938 this_cpu_inc(sch->cpu_qstats->drops); 939 } 940 941 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 942 { 943 sch->qstats.overlimits++; 944 } 945 946 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) 947 { 948 __u32 qlen = qdisc_qlen_sum(sch); 949 950 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); 951 } 952 953 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, 954 __u32 *backlog) 955 { 956 struct gnet_stats_queue qstats = { 0 }; 957 958 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats); 959 *qlen = qstats.qlen + qdisc_qlen(sch); 960 *backlog = qstats.backlog; 961 } 962 963 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch) 964 { 965 __u32 qlen, backlog; 966 967 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 968 qdisc_tree_reduce_backlog(sch, qlen, backlog); 969 } 970 971 static inline void qdisc_purge_queue(struct Qdisc *sch) 972 { 973 __u32 qlen, backlog; 974 975 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 976 qdisc_reset(sch); 977 qdisc_tree_reduce_backlog(sch, qlen, backlog); 978 } 979 980 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 981 struct qdisc_skb_head *qh) 982 { 983 struct sk_buff *last = qh->tail; 984 985 if (last) { 986 skb->next = NULL; 987 last->next = skb; 988 qh->tail = skb; 989 } else { 990 qh->tail = skb; 991 qh->head = skb; 992 } 993 qh->qlen++; 994 } 995 996 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 997 { 998 __qdisc_enqueue_tail(skb, &sch->q); 999 qdisc_qstats_backlog_inc(sch, skb); 1000 return NET_XMIT_SUCCESS; 1001 } 1002 1003 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 1004 struct qdisc_skb_head *qh) 1005 { 1006 skb->next = qh->head; 1007 1008 if (!qh->head) 1009 qh->tail = skb; 1010 qh->head = skb; 1011 qh->qlen++; 1012 } 1013 1014 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 1015 { 1016 struct sk_buff *skb = qh->head; 1017 1018 if (likely(skb != NULL)) { 1019 qh->head = skb->next; 1020 qh->qlen--; 1021 if (qh->head == NULL) 1022 qh->tail = NULL; 1023 skb->next = NULL; 1024 } 1025 1026 return skb; 1027 } 1028 1029 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 1030 { 1031 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 1032 1033 if (likely(skb != NULL)) { 1034 qdisc_qstats_backlog_dec(sch, skb); 1035 qdisc_bstats_update(sch, skb); 1036 } 1037 1038 return skb; 1039 } 1040 1041 struct tc_skb_cb { 1042 struct qdisc_skb_cb qdisc_cb; 1043 u32 drop_reason; 1044 1045 u16 zone; /* Only valid if post_ct = true */ 1046 u16 mru; 1047 u8 post_ct:1; 1048 u8 post_ct_snat:1; 1049 u8 post_ct_dnat:1; 1050 }; 1051 1052 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) 1053 { 1054 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; 1055 1056 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); 1057 return cb; 1058 } 1059 1060 static inline enum skb_drop_reason 1061 tcf_get_drop_reason(const struct sk_buff *skb) 1062 { 1063 return tc_skb_cb(skb)->drop_reason; 1064 } 1065 1066 static inline void tcf_set_drop_reason(const struct sk_buff *skb, 1067 enum skb_drop_reason reason) 1068 { 1069 tc_skb_cb(skb)->drop_reason = reason; 1070 } 1071 1072 /* Instead of calling kfree_skb() while root qdisc lock is held, 1073 * queue the skb for future freeing at end of __dev_xmit_skb() 1074 */ 1075 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 1076 { 1077 skb->next = *to_free; 1078 *to_free = skb; 1079 } 1080 1081 static inline void __qdisc_drop_all(struct sk_buff *skb, 1082 struct sk_buff **to_free) 1083 { 1084 if (skb->prev) 1085 skb->prev->next = *to_free; 1086 else 1087 skb->next = *to_free; 1088 *to_free = skb; 1089 } 1090 1091 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1092 struct qdisc_skb_head *qh, 1093 struct sk_buff **to_free) 1094 { 1095 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1096 1097 if (likely(skb != NULL)) { 1098 unsigned int len = qdisc_pkt_len(skb); 1099 1100 qdisc_qstats_backlog_dec(sch, skb); 1101 __qdisc_drop(skb, to_free); 1102 return len; 1103 } 1104 1105 return 0; 1106 } 1107 1108 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1109 { 1110 const struct qdisc_skb_head *qh = &sch->q; 1111 1112 return qh->head; 1113 } 1114 1115 /* generic pseudo peek method for non-work-conserving qdisc */ 1116 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1117 { 1118 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1119 1120 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1121 if (!skb) { 1122 skb = sch->dequeue(sch); 1123 1124 if (skb) { 1125 __skb_queue_head(&sch->gso_skb, skb); 1126 /* it's still part of the queue */ 1127 qdisc_qstats_backlog_inc(sch, skb); 1128 sch->q.qlen++; 1129 } 1130 } 1131 1132 return skb; 1133 } 1134 1135 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, 1136 struct sk_buff *skb) 1137 { 1138 if (qdisc_is_percpu_stats(sch)) { 1139 qdisc_qstats_cpu_backlog_dec(sch, skb); 1140 qdisc_bstats_cpu_update(sch, skb); 1141 qdisc_qstats_cpu_qlen_dec(sch); 1142 } else { 1143 qdisc_qstats_backlog_dec(sch, skb); 1144 qdisc_bstats_update(sch, skb); 1145 sch->q.qlen--; 1146 } 1147 } 1148 1149 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, 1150 unsigned int pkt_len) 1151 { 1152 if (qdisc_is_percpu_stats(sch)) { 1153 qdisc_qstats_cpu_qlen_inc(sch); 1154 this_cpu_add(sch->cpu_qstats->backlog, pkt_len); 1155 } else { 1156 sch->qstats.backlog += pkt_len; 1157 sch->q.qlen++; 1158 } 1159 } 1160 1161 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1162 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1163 { 1164 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1165 1166 if (skb) { 1167 skb = __skb_dequeue(&sch->gso_skb); 1168 if (qdisc_is_percpu_stats(sch)) { 1169 qdisc_qstats_cpu_backlog_dec(sch, skb); 1170 qdisc_qstats_cpu_qlen_dec(sch); 1171 } else { 1172 qdisc_qstats_backlog_dec(sch, skb); 1173 sch->q.qlen--; 1174 } 1175 } else { 1176 skb = sch->dequeue(sch); 1177 } 1178 1179 return skb; 1180 } 1181 1182 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1183 { 1184 /* 1185 * We do not know the backlog in bytes of this list, it 1186 * is up to the caller to correct it 1187 */ 1188 ASSERT_RTNL(); 1189 if (qh->qlen) { 1190 rtnl_kfree_skbs(qh->head, qh->tail); 1191 1192 qh->head = NULL; 1193 qh->tail = NULL; 1194 qh->qlen = 0; 1195 } 1196 } 1197 1198 static inline void qdisc_reset_queue(struct Qdisc *sch) 1199 { 1200 __qdisc_reset_queue(&sch->q); 1201 } 1202 1203 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1204 struct Qdisc **pold) 1205 { 1206 struct Qdisc *old; 1207 1208 sch_tree_lock(sch); 1209 old = *pold; 1210 *pold = new; 1211 if (old != NULL) 1212 qdisc_purge_queue(old); 1213 sch_tree_unlock(sch); 1214 1215 return old; 1216 } 1217 1218 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1219 { 1220 rtnl_kfree_skbs(skb, skb); 1221 qdisc_qstats_drop(sch); 1222 } 1223 1224 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1225 struct sk_buff **to_free) 1226 { 1227 __qdisc_drop(skb, to_free); 1228 qdisc_qstats_cpu_drop(sch); 1229 1230 return NET_XMIT_DROP; 1231 } 1232 1233 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1234 struct sk_buff **to_free) 1235 { 1236 __qdisc_drop(skb, to_free); 1237 qdisc_qstats_drop(sch); 1238 1239 return NET_XMIT_DROP; 1240 } 1241 1242 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1243 struct sk_buff **to_free) 1244 { 1245 __qdisc_drop_all(skb, to_free); 1246 qdisc_qstats_drop(sch); 1247 1248 return NET_XMIT_DROP; 1249 } 1250 1251 struct psched_ratecfg { 1252 u64 rate_bytes_ps; /* bytes per second */ 1253 u32 mult; 1254 u16 overhead; 1255 u16 mpu; 1256 u8 linklayer; 1257 u8 shift; 1258 }; 1259 1260 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1261 unsigned int len) 1262 { 1263 len += r->overhead; 1264 1265 if (len < r->mpu) 1266 len = r->mpu; 1267 1268 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1269 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1270 1271 return ((u64)len * r->mult) >> r->shift; 1272 } 1273 1274 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1275 const struct tc_ratespec *conf, 1276 u64 rate64); 1277 1278 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1279 const struct psched_ratecfg *r) 1280 { 1281 memset(res, 0, sizeof(*res)); 1282 1283 /* legacy struct tc_ratespec has a 32bit @rate field 1284 * Qdisc using 64bit rate should add new attributes 1285 * in order to maintain compatibility. 1286 */ 1287 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1288 1289 res->overhead = r->overhead; 1290 res->mpu = r->mpu; 1291 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 1292 } 1293 1294 struct psched_pktrate { 1295 u64 rate_pkts_ps; /* packets per second */ 1296 u32 mult; 1297 u8 shift; 1298 }; 1299 1300 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r, 1301 unsigned int pkt_num) 1302 { 1303 return ((u64)pkt_num * r->mult) >> r->shift; 1304 } 1305 1306 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64); 1307 1308 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 1309 * The fast path only needs to access filter list and to update stats 1310 */ 1311 struct mini_Qdisc { 1312 struct tcf_proto *filter_list; 1313 struct tcf_block *block; 1314 struct gnet_stats_basic_sync __percpu *cpu_bstats; 1315 struct gnet_stats_queue __percpu *cpu_qstats; 1316 unsigned long rcu_state; 1317 }; 1318 1319 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1320 const struct sk_buff *skb) 1321 { 1322 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb); 1323 } 1324 1325 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 1326 { 1327 this_cpu_inc(miniq->cpu_qstats->drops); 1328 } 1329 1330 struct mini_Qdisc_pair { 1331 struct mini_Qdisc miniq1; 1332 struct mini_Qdisc miniq2; 1333 struct mini_Qdisc __rcu **p_miniq; 1334 }; 1335 1336 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1337 struct tcf_proto *tp_head); 1338 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1339 struct mini_Qdisc __rcu **p_miniq); 1340 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, 1341 struct tcf_block *block); 1342 1343 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx); 1344 1345 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 1346 1347 /* Make sure qdisc is no longer in SCHED state. */ 1348 static inline void qdisc_synchronize(const struct Qdisc *q) 1349 { 1350 while (test_bit(__QDISC_STATE_SCHED, &q->state)) 1351 msleep(1); 1352 } 1353 1354 #endif 1355