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 return netdev_queue_dql_avail(txq); 242 } 243 244 struct Qdisc_class_ops { 245 unsigned int flags; 246 /* Child qdisc manipulation */ 247 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); 248 int (*graft)(struct Qdisc *, unsigned long cl, 249 struct Qdisc *, struct Qdisc **, 250 struct netlink_ext_ack *extack); 251 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); 252 void (*qlen_notify)(struct Qdisc *, unsigned long); 253 254 /* Class manipulation routines */ 255 unsigned long (*find)(struct Qdisc *, u32 classid); 256 int (*change)(struct Qdisc *, u32, u32, 257 struct nlattr **, unsigned long *, 258 struct netlink_ext_ack *); 259 int (*delete)(struct Qdisc *, unsigned long, 260 struct netlink_ext_ack *); 261 void (*walk)(struct Qdisc *, struct qdisc_walker * arg); 262 263 /* Filter manipulation */ 264 struct tcf_block * (*tcf_block)(struct Qdisc *sch, 265 unsigned long arg, 266 struct netlink_ext_ack *extack); 267 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, 268 u32 classid); 269 void (*unbind_tcf)(struct Qdisc *, unsigned long); 270 271 /* rtnetlink specific */ 272 int (*dump)(struct Qdisc *, unsigned long, 273 struct sk_buff *skb, struct tcmsg*); 274 int (*dump_stats)(struct Qdisc *, unsigned long, 275 struct gnet_dump *); 276 }; 277 278 /* Qdisc_class_ops flag values */ 279 280 /* Implements API that doesn't require rtnl lock */ 281 enum qdisc_class_ops_flags { 282 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, 283 }; 284 285 struct Qdisc_ops { 286 struct Qdisc_ops *next; 287 const struct Qdisc_class_ops *cl_ops; 288 char id[IFNAMSIZ]; 289 int priv_size; 290 unsigned int static_flags; 291 292 int (*enqueue)(struct sk_buff *skb, 293 struct Qdisc *sch, 294 struct sk_buff **to_free); 295 struct sk_buff * (*dequeue)(struct Qdisc *); 296 struct sk_buff * (*peek)(struct Qdisc *); 297 298 int (*init)(struct Qdisc *sch, struct nlattr *arg, 299 struct netlink_ext_ack *extack); 300 void (*reset)(struct Qdisc *); 301 void (*destroy)(struct Qdisc *); 302 int (*change)(struct Qdisc *sch, 303 struct nlattr *arg, 304 struct netlink_ext_ack *extack); 305 void (*attach)(struct Qdisc *sch); 306 int (*change_tx_queue_len)(struct Qdisc *, unsigned int); 307 void (*change_real_num_tx)(struct Qdisc *sch, 308 unsigned int new_real_tx); 309 310 int (*dump)(struct Qdisc *, struct sk_buff *); 311 int (*dump_stats)(struct Qdisc *, struct gnet_dump *); 312 313 void (*ingress_block_set)(struct Qdisc *sch, 314 u32 block_index); 315 void (*egress_block_set)(struct Qdisc *sch, 316 u32 block_index); 317 u32 (*ingress_block_get)(struct Qdisc *sch); 318 u32 (*egress_block_get)(struct Qdisc *sch); 319 320 struct module *owner; 321 }; 322 323 struct tcf_result { 324 union { 325 struct { 326 unsigned long class; 327 u32 classid; 328 }; 329 const struct tcf_proto *goto_tp; 330 }; 331 }; 332 333 struct tcf_chain; 334 335 struct tcf_proto_ops { 336 struct list_head head; 337 char kind[IFNAMSIZ]; 338 339 int (*classify)(struct sk_buff *, 340 const struct tcf_proto *, 341 struct tcf_result *); 342 int (*init)(struct tcf_proto*); 343 void (*destroy)(struct tcf_proto *tp, bool rtnl_held, 344 struct netlink_ext_ack *extack); 345 346 void* (*get)(struct tcf_proto*, u32 handle); 347 void (*put)(struct tcf_proto *tp, void *f); 348 int (*change)(struct net *net, struct sk_buff *, 349 struct tcf_proto*, unsigned long, 350 u32 handle, struct nlattr **, 351 void **, u32, 352 struct netlink_ext_ack *); 353 int (*delete)(struct tcf_proto *tp, void *arg, 354 bool *last, bool rtnl_held, 355 struct netlink_ext_ack *); 356 bool (*delete_empty)(struct tcf_proto *tp); 357 void (*walk)(struct tcf_proto *tp, 358 struct tcf_walker *arg, bool rtnl_held); 359 int (*reoffload)(struct tcf_proto *tp, bool add, 360 flow_setup_cb_t *cb, void *cb_priv, 361 struct netlink_ext_ack *extack); 362 void (*hw_add)(struct tcf_proto *tp, 363 void *type_data); 364 void (*hw_del)(struct tcf_proto *tp, 365 void *type_data); 366 void (*bind_class)(void *, u32, unsigned long, 367 void *, unsigned long); 368 void * (*tmplt_create)(struct net *net, 369 struct tcf_chain *chain, 370 struct nlattr **tca, 371 struct netlink_ext_ack *extack); 372 void (*tmplt_destroy)(void *tmplt_priv); 373 void (*tmplt_reoffload)(struct tcf_chain *chain, 374 bool add, 375 flow_setup_cb_t *cb, 376 void *cb_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 bool counted; 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 bool bypass_wanted; 476 atomic_t filtercnt; /* Number of filters */ 477 atomic_t skipswcnt; /* Number of skip_sw filters */ 478 atomic_t offloadcnt; /* Number of oddloaded filters */ 479 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ 480 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ 481 struct { 482 struct tcf_chain *chain; 483 struct list_head filter_chain_list; 484 } chain0; 485 struct rcu_head rcu; 486 DECLARE_HASHTABLE(proto_destroy_ht, 7); 487 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ 488 }; 489 490 struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index); 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(const struct Qdisc *q) 517 { 518 return q->q.qlen; 519 } 520 521 static inline int qdisc_qlen_sum(const struct Qdisc *q) 522 { 523 __u32 qlen = q->qstats.qlen; 524 int i; 525 526 if (qdisc_is_percpu_stats(q)) { 527 for_each_possible_cpu(i) 528 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; 529 } else { 530 qlen += q->q.qlen; 531 } 532 533 return qlen; 534 } 535 536 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 537 { 538 return (struct qdisc_skb_cb *)skb->cb; 539 } 540 541 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 542 { 543 return &qdisc->q.lock; 544 } 545 546 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 547 { 548 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 549 550 return q; 551 } 552 553 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) 554 { 555 return rcu_dereference_bh(qdisc->dev_queue->qdisc); 556 } 557 558 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 559 { 560 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping); 561 } 562 563 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 564 { 565 struct Qdisc *root = qdisc_root_sleeping(qdisc); 566 567 ASSERT_RTNL(); 568 return qdisc_lock(root); 569 } 570 571 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 572 { 573 return qdisc->dev_queue->dev; 574 } 575 576 static inline void sch_tree_lock(struct Qdisc *q) 577 { 578 if (q->flags & TCQ_F_MQROOT) 579 spin_lock_bh(qdisc_lock(q)); 580 else 581 spin_lock_bh(qdisc_root_sleeping_lock(q)); 582 } 583 584 static inline void sch_tree_unlock(struct Qdisc *q) 585 { 586 if (q->flags & TCQ_F_MQROOT) 587 spin_unlock_bh(qdisc_lock(q)); 588 else 589 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 590 } 591 592 extern struct Qdisc noop_qdisc; 593 extern struct Qdisc_ops noop_qdisc_ops; 594 extern struct Qdisc_ops pfifo_fast_ops; 595 extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1]; 596 extern struct Qdisc_ops mq_qdisc_ops; 597 extern struct Qdisc_ops noqueue_qdisc_ops; 598 extern const struct Qdisc_ops *default_qdisc_ops; 599 static inline const struct Qdisc_ops * 600 get_default_qdisc_ops(const struct net_device *dev, int ntx) 601 { 602 return ntx < dev->real_num_tx_queues ? 603 default_qdisc_ops : &pfifo_fast_ops; 604 } 605 606 struct Qdisc_class_common { 607 u32 classid; 608 unsigned int filter_cnt; 609 struct hlist_node hnode; 610 }; 611 612 struct Qdisc_class_hash { 613 struct hlist_head *hash; 614 unsigned int hashsize; 615 unsigned int hashmask; 616 unsigned int hashelems; 617 }; 618 619 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 620 { 621 id ^= id >> 8; 622 id ^= id >> 4; 623 return id & mask; 624 } 625 626 static inline struct Qdisc_class_common * 627 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 628 { 629 struct Qdisc_class_common *cl; 630 unsigned int h; 631 632 if (!id) 633 return NULL; 634 635 h = qdisc_class_hash(id, hash->hashmask); 636 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 637 if (cl->classid == id) 638 return cl; 639 } 640 return NULL; 641 } 642 643 static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl) 644 { 645 return cl->filter_cnt > 0; 646 } 647 648 static inline void qdisc_class_get(struct Qdisc_class_common *cl) 649 { 650 unsigned int res; 651 652 if (check_add_overflow(cl->filter_cnt, 1, &res)) 653 WARN(1, "Qdisc class overflow"); 654 655 cl->filter_cnt = res; 656 } 657 658 static inline void qdisc_class_put(struct Qdisc_class_common *cl) 659 { 660 unsigned int res; 661 662 if (check_sub_overflow(cl->filter_cnt, 1, &res)) 663 WARN(1, "Qdisc class underflow"); 664 665 cl->filter_cnt = res; 666 } 667 668 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 669 { 670 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 671 672 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 673 } 674 675 int qdisc_class_hash_init(struct Qdisc_class_hash *); 676 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 677 struct Qdisc_class_common *); 678 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 679 struct Qdisc_class_common *); 680 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 681 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 682 683 int dev_qdisc_change_tx_queue_len(struct net_device *dev); 684 void dev_qdisc_change_real_num_tx(struct net_device *dev, 685 unsigned int new_real_tx); 686 void dev_init_scheduler(struct net_device *dev); 687 void dev_shutdown(struct net_device *dev); 688 void dev_activate(struct net_device *dev); 689 void dev_deactivate(struct net_device *dev); 690 void dev_deactivate_many(struct list_head *head); 691 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 692 struct Qdisc *qdisc); 693 void qdisc_reset(struct Qdisc *qdisc); 694 void qdisc_destroy(struct Qdisc *qdisc); 695 void qdisc_put(struct Qdisc *qdisc); 696 void qdisc_put_unlocked(struct Qdisc *qdisc); 697 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); 698 #ifdef CONFIG_NET_SCHED 699 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 700 void *type_data); 701 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 702 struct Qdisc *new, struct Qdisc *old, 703 enum tc_setup_type type, void *type_data, 704 struct netlink_ext_ack *extack); 705 #else 706 static inline int 707 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 708 void *type_data) 709 { 710 q->flags &= ~TCQ_F_OFFLOADED; 711 return 0; 712 } 713 714 static inline void 715 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 716 struct Qdisc *new, struct Qdisc *old, 717 enum tc_setup_type type, void *type_data, 718 struct netlink_ext_ack *extack) 719 { 720 } 721 #endif 722 void qdisc_offload_query_caps(struct net_device *dev, 723 enum tc_setup_type type, 724 void *caps, size_t caps_len); 725 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 726 const struct Qdisc_ops *ops, 727 struct netlink_ext_ack *extack); 728 void qdisc_free(struct Qdisc *qdisc); 729 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 730 const struct Qdisc_ops *ops, u32 parentid, 731 struct netlink_ext_ack *extack); 732 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 733 const struct qdisc_size_table *stab); 734 int skb_do_redirect(struct sk_buff *); 735 736 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 737 { 738 #ifdef CONFIG_NET_XGRESS 739 return skb->tc_at_ingress; 740 #else 741 return false; 742 #endif 743 } 744 745 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 746 { 747 #ifdef CONFIG_NET_CLS_ACT 748 if (skb->tc_skip_classify) { 749 skb->tc_skip_classify = 0; 750 return true; 751 } 752 #endif 753 return false; 754 } 755 756 /* Reset all TX qdiscs greater than index of a device. */ 757 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 758 { 759 struct Qdisc *qdisc; 760 761 for (; i < dev->num_tx_queues; i++) { 762 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 763 if (qdisc) { 764 spin_lock_bh(qdisc_lock(qdisc)); 765 qdisc_reset(qdisc); 766 spin_unlock_bh(qdisc_lock(qdisc)); 767 } 768 } 769 } 770 771 /* Are all TX queues of the device empty? */ 772 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 773 { 774 unsigned int i; 775 776 rcu_read_lock(); 777 for (i = 0; i < dev->num_tx_queues; i++) { 778 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 779 const struct Qdisc *q = rcu_dereference(txq->qdisc); 780 781 if (!qdisc_is_empty(q)) { 782 rcu_read_unlock(); 783 return false; 784 } 785 } 786 rcu_read_unlock(); 787 return true; 788 } 789 790 /* Are any of the TX qdiscs changing? */ 791 static inline bool qdisc_tx_changing(const struct net_device *dev) 792 { 793 unsigned int i; 794 795 for (i = 0; i < dev->num_tx_queues; i++) { 796 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 797 798 if (rcu_access_pointer(txq->qdisc) != 799 rcu_access_pointer(txq->qdisc_sleeping)) 800 return true; 801 } 802 return false; 803 } 804 805 /* Is the device using the noop qdisc on all queues? */ 806 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 807 { 808 unsigned int i; 809 810 for (i = 0; i < dev->num_tx_queues; i++) { 811 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 812 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 813 return false; 814 } 815 return true; 816 } 817 818 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 819 { 820 return qdisc_skb_cb(skb)->pkt_len; 821 } 822 823 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 824 enum net_xmit_qdisc_t { 825 __NET_XMIT_STOLEN = 0x00010000, 826 __NET_XMIT_BYPASS = 0x00020000, 827 }; 828 829 #ifdef CONFIG_NET_CLS_ACT 830 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 831 #else 832 #define net_xmit_drop_count(e) (1) 833 #endif 834 835 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 836 const struct Qdisc *sch) 837 { 838 #ifdef CONFIG_NET_SCHED 839 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 840 841 if (stab) 842 __qdisc_calculate_pkt_len(skb, stab); 843 #endif 844 } 845 846 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 847 struct sk_buff **to_free) 848 { 849 qdisc_calculate_pkt_len(skb, sch); 850 return sch->enqueue(skb, sch, to_free); 851 } 852 853 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats, 854 __u64 bytes, __u32 packets) 855 { 856 u64_stats_update_begin(&bstats->syncp); 857 u64_stats_add(&bstats->bytes, bytes); 858 u64_stats_add(&bstats->packets, packets); 859 u64_stats_update_end(&bstats->syncp); 860 } 861 862 static inline void bstats_update(struct gnet_stats_basic_sync *bstats, 863 const struct sk_buff *skb) 864 { 865 _bstats_update(bstats, 866 qdisc_pkt_len(skb), 867 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); 868 } 869 870 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 871 const struct sk_buff *skb) 872 { 873 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb); 874 } 875 876 static inline void qdisc_bstats_update(struct Qdisc *sch, 877 const struct sk_buff *skb) 878 { 879 bstats_update(&sch->bstats, skb); 880 } 881 882 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 883 const struct sk_buff *skb) 884 { 885 sch->qstats.backlog -= qdisc_pkt_len(skb); 886 } 887 888 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 889 const struct sk_buff *skb) 890 { 891 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 892 } 893 894 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 895 const struct sk_buff *skb) 896 { 897 sch->qstats.backlog += qdisc_pkt_len(skb); 898 } 899 900 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 901 const struct sk_buff *skb) 902 { 903 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 904 } 905 906 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 907 { 908 this_cpu_inc(sch->cpu_qstats->qlen); 909 } 910 911 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 912 { 913 this_cpu_dec(sch->cpu_qstats->qlen); 914 } 915 916 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 917 { 918 this_cpu_inc(sch->cpu_qstats->requeues); 919 } 920 921 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 922 { 923 sch->qstats.drops += count; 924 } 925 926 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 927 { 928 qstats->drops++; 929 } 930 931 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 932 { 933 qstats->overlimits++; 934 } 935 936 static inline void qdisc_qstats_drop(struct Qdisc *sch) 937 { 938 qstats_drop_inc(&sch->qstats); 939 } 940 941 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 942 { 943 this_cpu_inc(sch->cpu_qstats->drops); 944 } 945 946 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 947 { 948 sch->qstats.overlimits++; 949 } 950 951 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) 952 { 953 __u32 qlen = qdisc_qlen_sum(sch); 954 955 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); 956 } 957 958 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, 959 __u32 *backlog) 960 { 961 struct gnet_stats_queue qstats = { 0 }; 962 963 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats); 964 *qlen = qstats.qlen + qdisc_qlen(sch); 965 *backlog = qstats.backlog; 966 } 967 968 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch) 969 { 970 __u32 qlen, backlog; 971 972 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 973 qdisc_tree_reduce_backlog(sch, qlen, backlog); 974 } 975 976 static inline void qdisc_purge_queue(struct Qdisc *sch) 977 { 978 __u32 qlen, backlog; 979 980 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 981 qdisc_reset(sch); 982 qdisc_tree_reduce_backlog(sch, qlen, backlog); 983 } 984 985 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 986 struct qdisc_skb_head *qh) 987 { 988 struct sk_buff *last = qh->tail; 989 990 if (last) { 991 skb->next = NULL; 992 last->next = skb; 993 qh->tail = skb; 994 } else { 995 qh->tail = skb; 996 qh->head = skb; 997 } 998 qh->qlen++; 999 } 1000 1001 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 1002 { 1003 __qdisc_enqueue_tail(skb, &sch->q); 1004 qdisc_qstats_backlog_inc(sch, skb); 1005 return NET_XMIT_SUCCESS; 1006 } 1007 1008 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 1009 struct qdisc_skb_head *qh) 1010 { 1011 skb->next = qh->head; 1012 1013 if (!qh->head) 1014 qh->tail = skb; 1015 qh->head = skb; 1016 qh->qlen++; 1017 } 1018 1019 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 1020 { 1021 struct sk_buff *skb = qh->head; 1022 1023 if (likely(skb != NULL)) { 1024 qh->head = skb->next; 1025 qh->qlen--; 1026 if (qh->head == NULL) 1027 qh->tail = NULL; 1028 skb->next = NULL; 1029 } 1030 1031 return skb; 1032 } 1033 1034 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 1035 { 1036 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 1037 1038 if (likely(skb != NULL)) { 1039 qdisc_qstats_backlog_dec(sch, skb); 1040 qdisc_bstats_update(sch, skb); 1041 } 1042 1043 return skb; 1044 } 1045 1046 struct tc_skb_cb { 1047 struct qdisc_skb_cb qdisc_cb; 1048 u32 drop_reason; 1049 1050 u16 zone; /* Only valid if post_ct = true */ 1051 u16 mru; 1052 u8 post_ct:1; 1053 u8 post_ct_snat:1; 1054 u8 post_ct_dnat:1; 1055 }; 1056 1057 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) 1058 { 1059 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; 1060 1061 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); 1062 return cb; 1063 } 1064 1065 static inline enum skb_drop_reason 1066 tcf_get_drop_reason(const struct sk_buff *skb) 1067 { 1068 return tc_skb_cb(skb)->drop_reason; 1069 } 1070 1071 static inline void tcf_set_drop_reason(const struct sk_buff *skb, 1072 enum skb_drop_reason reason) 1073 { 1074 tc_skb_cb(skb)->drop_reason = reason; 1075 } 1076 1077 /* Instead of calling kfree_skb() while root qdisc lock is held, 1078 * queue the skb for future freeing at end of __dev_xmit_skb() 1079 */ 1080 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 1081 { 1082 skb->next = *to_free; 1083 *to_free = skb; 1084 } 1085 1086 static inline void __qdisc_drop_all(struct sk_buff *skb, 1087 struct sk_buff **to_free) 1088 { 1089 if (skb->prev) 1090 skb->prev->next = *to_free; 1091 else 1092 skb->next = *to_free; 1093 *to_free = skb; 1094 } 1095 1096 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1097 struct qdisc_skb_head *qh, 1098 struct sk_buff **to_free) 1099 { 1100 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1101 1102 if (likely(skb != NULL)) { 1103 unsigned int len = qdisc_pkt_len(skb); 1104 1105 qdisc_qstats_backlog_dec(sch, skb); 1106 __qdisc_drop(skb, to_free); 1107 return len; 1108 } 1109 1110 return 0; 1111 } 1112 1113 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1114 { 1115 const struct qdisc_skb_head *qh = &sch->q; 1116 1117 return qh->head; 1118 } 1119 1120 /* generic pseudo peek method for non-work-conserving qdisc */ 1121 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1122 { 1123 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1124 1125 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1126 if (!skb) { 1127 skb = sch->dequeue(sch); 1128 1129 if (skb) { 1130 __skb_queue_head(&sch->gso_skb, skb); 1131 /* it's still part of the queue */ 1132 qdisc_qstats_backlog_inc(sch, skb); 1133 sch->q.qlen++; 1134 } 1135 } 1136 1137 return skb; 1138 } 1139 1140 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, 1141 struct sk_buff *skb) 1142 { 1143 if (qdisc_is_percpu_stats(sch)) { 1144 qdisc_qstats_cpu_backlog_dec(sch, skb); 1145 qdisc_bstats_cpu_update(sch, skb); 1146 qdisc_qstats_cpu_qlen_dec(sch); 1147 } else { 1148 qdisc_qstats_backlog_dec(sch, skb); 1149 qdisc_bstats_update(sch, skb); 1150 sch->q.qlen--; 1151 } 1152 } 1153 1154 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, 1155 unsigned int pkt_len) 1156 { 1157 if (qdisc_is_percpu_stats(sch)) { 1158 qdisc_qstats_cpu_qlen_inc(sch); 1159 this_cpu_add(sch->cpu_qstats->backlog, pkt_len); 1160 } else { 1161 sch->qstats.backlog += pkt_len; 1162 sch->q.qlen++; 1163 } 1164 } 1165 1166 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1167 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1168 { 1169 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1170 1171 if (skb) { 1172 skb = __skb_dequeue(&sch->gso_skb); 1173 if (qdisc_is_percpu_stats(sch)) { 1174 qdisc_qstats_cpu_backlog_dec(sch, skb); 1175 qdisc_qstats_cpu_qlen_dec(sch); 1176 } else { 1177 qdisc_qstats_backlog_dec(sch, skb); 1178 sch->q.qlen--; 1179 } 1180 } else { 1181 skb = sch->dequeue(sch); 1182 } 1183 1184 return skb; 1185 } 1186 1187 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1188 { 1189 /* 1190 * We do not know the backlog in bytes of this list, it 1191 * is up to the caller to correct it 1192 */ 1193 ASSERT_RTNL(); 1194 if (qh->qlen) { 1195 rtnl_kfree_skbs(qh->head, qh->tail); 1196 1197 qh->head = NULL; 1198 qh->tail = NULL; 1199 qh->qlen = 0; 1200 } 1201 } 1202 1203 static inline void qdisc_reset_queue(struct Qdisc *sch) 1204 { 1205 __qdisc_reset_queue(&sch->q); 1206 } 1207 1208 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1209 struct Qdisc **pold) 1210 { 1211 struct Qdisc *old; 1212 1213 sch_tree_lock(sch); 1214 old = *pold; 1215 *pold = new; 1216 if (old != NULL) 1217 qdisc_purge_queue(old); 1218 sch_tree_unlock(sch); 1219 1220 return old; 1221 } 1222 1223 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1224 { 1225 rtnl_kfree_skbs(skb, skb); 1226 qdisc_qstats_drop(sch); 1227 } 1228 1229 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1230 struct sk_buff **to_free) 1231 { 1232 __qdisc_drop(skb, to_free); 1233 qdisc_qstats_cpu_drop(sch); 1234 1235 return NET_XMIT_DROP; 1236 } 1237 1238 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1239 struct sk_buff **to_free) 1240 { 1241 __qdisc_drop(skb, to_free); 1242 qdisc_qstats_drop(sch); 1243 1244 return NET_XMIT_DROP; 1245 } 1246 1247 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1248 struct sk_buff **to_free) 1249 { 1250 __qdisc_drop_all(skb, to_free); 1251 qdisc_qstats_drop(sch); 1252 1253 return NET_XMIT_DROP; 1254 } 1255 1256 struct psched_ratecfg { 1257 u64 rate_bytes_ps; /* bytes per second */ 1258 u32 mult; 1259 u16 overhead; 1260 u16 mpu; 1261 u8 linklayer; 1262 u8 shift; 1263 }; 1264 1265 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1266 unsigned int len) 1267 { 1268 len += r->overhead; 1269 1270 if (len < r->mpu) 1271 len = r->mpu; 1272 1273 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1274 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1275 1276 return ((u64)len * r->mult) >> r->shift; 1277 } 1278 1279 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1280 const struct tc_ratespec *conf, 1281 u64 rate64); 1282 1283 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1284 const struct psched_ratecfg *r) 1285 { 1286 memset(res, 0, sizeof(*res)); 1287 1288 /* legacy struct tc_ratespec has a 32bit @rate field 1289 * Qdisc using 64bit rate should add new attributes 1290 * in order to maintain compatibility. 1291 */ 1292 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1293 1294 res->overhead = r->overhead; 1295 res->mpu = r->mpu; 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_sync __percpu *cpu_bstats; 1320 struct gnet_stats_queue __percpu *cpu_qstats; 1321 unsigned long rcu_state; 1322 }; 1323 1324 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1325 const struct sk_buff *skb) 1326 { 1327 bstats_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 /* Make sure qdisc is no longer in SCHED state. */ 1353 static inline void qdisc_synchronize(const struct Qdisc *q) 1354 { 1355 while (test_bit(__QDISC_STATE_SCHED, &q->state)) 1356 msleep(1); 1357 } 1358 1359 #endif 1360