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 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 struct xarray ports; /* datapath accessible */ 460 /* Lock protects tcf_block and lifetime-management data of chains 461 * attached to the block (refcnt, action_refcnt, explicitly_created). 462 */ 463 struct mutex lock; 464 struct list_head chain_list; 465 u32 index; /* block index for shared blocks */ 466 u32 classid; /* which class this block belongs to */ 467 refcount_t refcnt; 468 struct net *net; 469 struct Qdisc *q; 470 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */ 471 struct flow_block flow_block; 472 struct list_head owner_list; 473 bool keep_dst; 474 atomic_t offloadcnt; /* Number of oddloaded filters */ 475 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ 476 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ 477 struct { 478 struct tcf_chain *chain; 479 struct list_head filter_chain_list; 480 } chain0; 481 struct rcu_head rcu; 482 DECLARE_HASHTABLE(proto_destroy_ht, 7); 483 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ 484 }; 485 486 struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index); 487 488 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) 489 { 490 return lockdep_is_held(&chain->filter_chain_lock); 491 } 492 493 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) 494 { 495 return lockdep_is_held(&tp->lock); 496 } 497 498 #define tcf_chain_dereference(p, chain) \ 499 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) 500 501 #define tcf_proto_dereference(p, tp) \ 502 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) 503 504 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 505 { 506 struct qdisc_skb_cb *qcb; 507 508 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb)); 509 BUILD_BUG_ON(sizeof(qcb->data) < sz); 510 } 511 512 static inline int qdisc_qlen(const struct Qdisc *q) 513 { 514 return q->q.qlen; 515 } 516 517 static inline int qdisc_qlen_sum(const struct Qdisc *q) 518 { 519 __u32 qlen = q->qstats.qlen; 520 int i; 521 522 if (qdisc_is_percpu_stats(q)) { 523 for_each_possible_cpu(i) 524 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; 525 } else { 526 qlen += q->q.qlen; 527 } 528 529 return qlen; 530 } 531 532 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 533 { 534 return (struct qdisc_skb_cb *)skb->cb; 535 } 536 537 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 538 { 539 return &qdisc->q.lock; 540 } 541 542 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 543 { 544 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 545 546 return q; 547 } 548 549 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) 550 { 551 return rcu_dereference_bh(qdisc->dev_queue->qdisc); 552 } 553 554 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 555 { 556 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping); 557 } 558 559 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 560 { 561 struct Qdisc *root = qdisc_root_sleeping(qdisc); 562 563 ASSERT_RTNL(); 564 return qdisc_lock(root); 565 } 566 567 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 568 { 569 return qdisc->dev_queue->dev; 570 } 571 572 static inline void sch_tree_lock(struct Qdisc *q) 573 { 574 if (q->flags & TCQ_F_MQROOT) 575 spin_lock_bh(qdisc_lock(q)); 576 else 577 spin_lock_bh(qdisc_root_sleeping_lock(q)); 578 } 579 580 static inline void sch_tree_unlock(struct Qdisc *q) 581 { 582 if (q->flags & TCQ_F_MQROOT) 583 spin_unlock_bh(qdisc_lock(q)); 584 else 585 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 586 } 587 588 extern struct Qdisc noop_qdisc; 589 extern struct Qdisc_ops noop_qdisc_ops; 590 extern struct Qdisc_ops pfifo_fast_ops; 591 extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1]; 592 extern struct Qdisc_ops mq_qdisc_ops; 593 extern struct Qdisc_ops noqueue_qdisc_ops; 594 extern const struct Qdisc_ops *default_qdisc_ops; 595 static inline const struct Qdisc_ops * 596 get_default_qdisc_ops(const struct net_device *dev, int ntx) 597 { 598 return ntx < dev->real_num_tx_queues ? 599 default_qdisc_ops : &pfifo_fast_ops; 600 } 601 602 struct Qdisc_class_common { 603 u32 classid; 604 unsigned int filter_cnt; 605 struct hlist_node hnode; 606 }; 607 608 struct Qdisc_class_hash { 609 struct hlist_head *hash; 610 unsigned int hashsize; 611 unsigned int hashmask; 612 unsigned int hashelems; 613 }; 614 615 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 616 { 617 id ^= id >> 8; 618 id ^= id >> 4; 619 return id & mask; 620 } 621 622 static inline struct Qdisc_class_common * 623 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 624 { 625 struct Qdisc_class_common *cl; 626 unsigned int h; 627 628 if (!id) 629 return NULL; 630 631 h = qdisc_class_hash(id, hash->hashmask); 632 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 633 if (cl->classid == id) 634 return cl; 635 } 636 return NULL; 637 } 638 639 static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl) 640 { 641 return cl->filter_cnt > 0; 642 } 643 644 static inline void qdisc_class_get(struct Qdisc_class_common *cl) 645 { 646 unsigned int res; 647 648 if (check_add_overflow(cl->filter_cnt, 1, &res)) 649 WARN(1, "Qdisc class overflow"); 650 651 cl->filter_cnt = res; 652 } 653 654 static inline void qdisc_class_put(struct Qdisc_class_common *cl) 655 { 656 unsigned int res; 657 658 if (check_sub_overflow(cl->filter_cnt, 1, &res)) 659 WARN(1, "Qdisc class underflow"); 660 661 cl->filter_cnt = res; 662 } 663 664 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 665 { 666 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 667 668 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 669 } 670 671 int qdisc_class_hash_init(struct Qdisc_class_hash *); 672 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 673 struct Qdisc_class_common *); 674 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 675 struct Qdisc_class_common *); 676 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 677 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 678 679 int dev_qdisc_change_tx_queue_len(struct net_device *dev); 680 void dev_qdisc_change_real_num_tx(struct net_device *dev, 681 unsigned int new_real_tx); 682 void dev_init_scheduler(struct net_device *dev); 683 void dev_shutdown(struct net_device *dev); 684 void dev_activate(struct net_device *dev); 685 void dev_deactivate(struct net_device *dev); 686 void dev_deactivate_many(struct list_head *head); 687 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 688 struct Qdisc *qdisc); 689 void qdisc_reset(struct Qdisc *qdisc); 690 void qdisc_destroy(struct Qdisc *qdisc); 691 void qdisc_put(struct Qdisc *qdisc); 692 void qdisc_put_unlocked(struct Qdisc *qdisc); 693 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); 694 #ifdef CONFIG_NET_SCHED 695 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 696 void *type_data); 697 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 698 struct Qdisc *new, struct Qdisc *old, 699 enum tc_setup_type type, void *type_data, 700 struct netlink_ext_ack *extack); 701 #else 702 static inline int 703 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 704 void *type_data) 705 { 706 q->flags &= ~TCQ_F_OFFLOADED; 707 return 0; 708 } 709 710 static inline void 711 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 712 struct Qdisc *new, struct Qdisc *old, 713 enum tc_setup_type type, void *type_data, 714 struct netlink_ext_ack *extack) 715 { 716 } 717 #endif 718 void qdisc_offload_query_caps(struct net_device *dev, 719 enum tc_setup_type type, 720 void *caps, size_t caps_len); 721 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 722 const struct Qdisc_ops *ops, 723 struct netlink_ext_ack *extack); 724 void qdisc_free(struct Qdisc *qdisc); 725 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 726 const struct Qdisc_ops *ops, u32 parentid, 727 struct netlink_ext_ack *extack); 728 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 729 const struct qdisc_size_table *stab); 730 int skb_do_redirect(struct sk_buff *); 731 732 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 733 { 734 #ifdef CONFIG_NET_XGRESS 735 return skb->tc_at_ingress; 736 #else 737 return false; 738 #endif 739 } 740 741 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 742 { 743 #ifdef CONFIG_NET_CLS_ACT 744 if (skb->tc_skip_classify) { 745 skb->tc_skip_classify = 0; 746 return true; 747 } 748 #endif 749 return false; 750 } 751 752 /* Reset all TX qdiscs greater than index of a device. */ 753 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 754 { 755 struct Qdisc *qdisc; 756 757 for (; i < dev->num_tx_queues; i++) { 758 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 759 if (qdisc) { 760 spin_lock_bh(qdisc_lock(qdisc)); 761 qdisc_reset(qdisc); 762 spin_unlock_bh(qdisc_lock(qdisc)); 763 } 764 } 765 } 766 767 /* Are all TX queues of the device empty? */ 768 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 769 { 770 unsigned int i; 771 772 rcu_read_lock(); 773 for (i = 0; i < dev->num_tx_queues; i++) { 774 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 775 const struct Qdisc *q = rcu_dereference(txq->qdisc); 776 777 if (!qdisc_is_empty(q)) { 778 rcu_read_unlock(); 779 return false; 780 } 781 } 782 rcu_read_unlock(); 783 return true; 784 } 785 786 /* Are any of the TX qdiscs changing? */ 787 static inline bool qdisc_tx_changing(const struct net_device *dev) 788 { 789 unsigned int i; 790 791 for (i = 0; i < dev->num_tx_queues; i++) { 792 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 793 794 if (rcu_access_pointer(txq->qdisc) != 795 rcu_access_pointer(txq->qdisc_sleeping)) 796 return true; 797 } 798 return false; 799 } 800 801 /* Is the device using the noop qdisc on all queues? */ 802 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 803 { 804 unsigned int i; 805 806 for (i = 0; i < dev->num_tx_queues; i++) { 807 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 808 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 809 return false; 810 } 811 return true; 812 } 813 814 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 815 { 816 return qdisc_skb_cb(skb)->pkt_len; 817 } 818 819 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 820 enum net_xmit_qdisc_t { 821 __NET_XMIT_STOLEN = 0x00010000, 822 __NET_XMIT_BYPASS = 0x00020000, 823 }; 824 825 #ifdef CONFIG_NET_CLS_ACT 826 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 827 #else 828 #define net_xmit_drop_count(e) (1) 829 #endif 830 831 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 832 const struct Qdisc *sch) 833 { 834 #ifdef CONFIG_NET_SCHED 835 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 836 837 if (stab) 838 __qdisc_calculate_pkt_len(skb, stab); 839 #endif 840 } 841 842 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 843 struct sk_buff **to_free) 844 { 845 qdisc_calculate_pkt_len(skb, sch); 846 return sch->enqueue(skb, sch, to_free); 847 } 848 849 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats, 850 __u64 bytes, __u32 packets) 851 { 852 u64_stats_update_begin(&bstats->syncp); 853 u64_stats_add(&bstats->bytes, bytes); 854 u64_stats_add(&bstats->packets, packets); 855 u64_stats_update_end(&bstats->syncp); 856 } 857 858 static inline void bstats_update(struct gnet_stats_basic_sync *bstats, 859 const struct sk_buff *skb) 860 { 861 _bstats_update(bstats, 862 qdisc_pkt_len(skb), 863 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); 864 } 865 866 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 867 const struct sk_buff *skb) 868 { 869 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb); 870 } 871 872 static inline void qdisc_bstats_update(struct Qdisc *sch, 873 const struct sk_buff *skb) 874 { 875 bstats_update(&sch->bstats, skb); 876 } 877 878 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 879 const struct sk_buff *skb) 880 { 881 sch->qstats.backlog -= qdisc_pkt_len(skb); 882 } 883 884 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 885 const struct sk_buff *skb) 886 { 887 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 888 } 889 890 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 891 const struct sk_buff *skb) 892 { 893 sch->qstats.backlog += qdisc_pkt_len(skb); 894 } 895 896 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 897 const struct sk_buff *skb) 898 { 899 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 900 } 901 902 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 903 { 904 this_cpu_inc(sch->cpu_qstats->qlen); 905 } 906 907 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 908 { 909 this_cpu_dec(sch->cpu_qstats->qlen); 910 } 911 912 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 913 { 914 this_cpu_inc(sch->cpu_qstats->requeues); 915 } 916 917 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 918 { 919 sch->qstats.drops += count; 920 } 921 922 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 923 { 924 qstats->drops++; 925 } 926 927 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 928 { 929 qstats->overlimits++; 930 } 931 932 static inline void qdisc_qstats_drop(struct Qdisc *sch) 933 { 934 qstats_drop_inc(&sch->qstats); 935 } 936 937 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 938 { 939 this_cpu_inc(sch->cpu_qstats->drops); 940 } 941 942 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 943 { 944 sch->qstats.overlimits++; 945 } 946 947 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) 948 { 949 __u32 qlen = qdisc_qlen_sum(sch); 950 951 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); 952 } 953 954 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, 955 __u32 *backlog) 956 { 957 struct gnet_stats_queue qstats = { 0 }; 958 959 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats); 960 *qlen = qstats.qlen + qdisc_qlen(sch); 961 *backlog = qstats.backlog; 962 } 963 964 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch) 965 { 966 __u32 qlen, backlog; 967 968 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 969 qdisc_tree_reduce_backlog(sch, qlen, backlog); 970 } 971 972 static inline void qdisc_purge_queue(struct Qdisc *sch) 973 { 974 __u32 qlen, backlog; 975 976 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 977 qdisc_reset(sch); 978 qdisc_tree_reduce_backlog(sch, qlen, backlog); 979 } 980 981 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 982 struct qdisc_skb_head *qh) 983 { 984 struct sk_buff *last = qh->tail; 985 986 if (last) { 987 skb->next = NULL; 988 last->next = skb; 989 qh->tail = skb; 990 } else { 991 qh->tail = skb; 992 qh->head = skb; 993 } 994 qh->qlen++; 995 } 996 997 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 998 { 999 __qdisc_enqueue_tail(skb, &sch->q); 1000 qdisc_qstats_backlog_inc(sch, skb); 1001 return NET_XMIT_SUCCESS; 1002 } 1003 1004 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 1005 struct qdisc_skb_head *qh) 1006 { 1007 skb->next = qh->head; 1008 1009 if (!qh->head) 1010 qh->tail = skb; 1011 qh->head = skb; 1012 qh->qlen++; 1013 } 1014 1015 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 1016 { 1017 struct sk_buff *skb = qh->head; 1018 1019 if (likely(skb != NULL)) { 1020 qh->head = skb->next; 1021 qh->qlen--; 1022 if (qh->head == NULL) 1023 qh->tail = NULL; 1024 skb->next = NULL; 1025 } 1026 1027 return skb; 1028 } 1029 1030 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 1031 { 1032 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 1033 1034 if (likely(skb != NULL)) { 1035 qdisc_qstats_backlog_dec(sch, skb); 1036 qdisc_bstats_update(sch, skb); 1037 } 1038 1039 return skb; 1040 } 1041 1042 struct tc_skb_cb { 1043 struct qdisc_skb_cb qdisc_cb; 1044 u32 drop_reason; 1045 1046 u16 zone; /* Only valid if post_ct = true */ 1047 u16 mru; 1048 u8 post_ct:1; 1049 u8 post_ct_snat:1; 1050 u8 post_ct_dnat:1; 1051 }; 1052 1053 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) 1054 { 1055 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; 1056 1057 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); 1058 return cb; 1059 } 1060 1061 static inline enum skb_drop_reason 1062 tcf_get_drop_reason(const struct sk_buff *skb) 1063 { 1064 return tc_skb_cb(skb)->drop_reason; 1065 } 1066 1067 static inline void tcf_set_drop_reason(const struct sk_buff *skb, 1068 enum skb_drop_reason reason) 1069 { 1070 tc_skb_cb(skb)->drop_reason = reason; 1071 } 1072 1073 /* Instead of calling kfree_skb() while root qdisc lock is held, 1074 * queue the skb for future freeing at end of __dev_xmit_skb() 1075 */ 1076 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 1077 { 1078 skb->next = *to_free; 1079 *to_free = skb; 1080 } 1081 1082 static inline void __qdisc_drop_all(struct sk_buff *skb, 1083 struct sk_buff **to_free) 1084 { 1085 if (skb->prev) 1086 skb->prev->next = *to_free; 1087 else 1088 skb->next = *to_free; 1089 *to_free = skb; 1090 } 1091 1092 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1093 struct qdisc_skb_head *qh, 1094 struct sk_buff **to_free) 1095 { 1096 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1097 1098 if (likely(skb != NULL)) { 1099 unsigned int len = qdisc_pkt_len(skb); 1100 1101 qdisc_qstats_backlog_dec(sch, skb); 1102 __qdisc_drop(skb, to_free); 1103 return len; 1104 } 1105 1106 return 0; 1107 } 1108 1109 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1110 { 1111 const struct qdisc_skb_head *qh = &sch->q; 1112 1113 return qh->head; 1114 } 1115 1116 /* generic pseudo peek method for non-work-conserving qdisc */ 1117 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1118 { 1119 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1120 1121 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1122 if (!skb) { 1123 skb = sch->dequeue(sch); 1124 1125 if (skb) { 1126 __skb_queue_head(&sch->gso_skb, skb); 1127 /* it's still part of the queue */ 1128 qdisc_qstats_backlog_inc(sch, skb); 1129 sch->q.qlen++; 1130 } 1131 } 1132 1133 return skb; 1134 } 1135 1136 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, 1137 struct sk_buff *skb) 1138 { 1139 if (qdisc_is_percpu_stats(sch)) { 1140 qdisc_qstats_cpu_backlog_dec(sch, skb); 1141 qdisc_bstats_cpu_update(sch, skb); 1142 qdisc_qstats_cpu_qlen_dec(sch); 1143 } else { 1144 qdisc_qstats_backlog_dec(sch, skb); 1145 qdisc_bstats_update(sch, skb); 1146 sch->q.qlen--; 1147 } 1148 } 1149 1150 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, 1151 unsigned int pkt_len) 1152 { 1153 if (qdisc_is_percpu_stats(sch)) { 1154 qdisc_qstats_cpu_qlen_inc(sch); 1155 this_cpu_add(sch->cpu_qstats->backlog, pkt_len); 1156 } else { 1157 sch->qstats.backlog += pkt_len; 1158 sch->q.qlen++; 1159 } 1160 } 1161 1162 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1163 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1164 { 1165 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1166 1167 if (skb) { 1168 skb = __skb_dequeue(&sch->gso_skb); 1169 if (qdisc_is_percpu_stats(sch)) { 1170 qdisc_qstats_cpu_backlog_dec(sch, skb); 1171 qdisc_qstats_cpu_qlen_dec(sch); 1172 } else { 1173 qdisc_qstats_backlog_dec(sch, skb); 1174 sch->q.qlen--; 1175 } 1176 } else { 1177 skb = sch->dequeue(sch); 1178 } 1179 1180 return skb; 1181 } 1182 1183 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1184 { 1185 /* 1186 * We do not know the backlog in bytes of this list, it 1187 * is up to the caller to correct it 1188 */ 1189 ASSERT_RTNL(); 1190 if (qh->qlen) { 1191 rtnl_kfree_skbs(qh->head, qh->tail); 1192 1193 qh->head = NULL; 1194 qh->tail = NULL; 1195 qh->qlen = 0; 1196 } 1197 } 1198 1199 static inline void qdisc_reset_queue(struct Qdisc *sch) 1200 { 1201 __qdisc_reset_queue(&sch->q); 1202 } 1203 1204 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1205 struct Qdisc **pold) 1206 { 1207 struct Qdisc *old; 1208 1209 sch_tree_lock(sch); 1210 old = *pold; 1211 *pold = new; 1212 if (old != NULL) 1213 qdisc_purge_queue(old); 1214 sch_tree_unlock(sch); 1215 1216 return old; 1217 } 1218 1219 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1220 { 1221 rtnl_kfree_skbs(skb, skb); 1222 qdisc_qstats_drop(sch); 1223 } 1224 1225 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1226 struct sk_buff **to_free) 1227 { 1228 __qdisc_drop(skb, to_free); 1229 qdisc_qstats_cpu_drop(sch); 1230 1231 return NET_XMIT_DROP; 1232 } 1233 1234 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1235 struct sk_buff **to_free) 1236 { 1237 __qdisc_drop(skb, to_free); 1238 qdisc_qstats_drop(sch); 1239 1240 return NET_XMIT_DROP; 1241 } 1242 1243 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1244 struct sk_buff **to_free) 1245 { 1246 __qdisc_drop_all(skb, to_free); 1247 qdisc_qstats_drop(sch); 1248 1249 return NET_XMIT_DROP; 1250 } 1251 1252 struct psched_ratecfg { 1253 u64 rate_bytes_ps; /* bytes per second */ 1254 u32 mult; 1255 u16 overhead; 1256 u16 mpu; 1257 u8 linklayer; 1258 u8 shift; 1259 }; 1260 1261 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1262 unsigned int len) 1263 { 1264 len += r->overhead; 1265 1266 if (len < r->mpu) 1267 len = r->mpu; 1268 1269 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1270 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1271 1272 return ((u64)len * r->mult) >> r->shift; 1273 } 1274 1275 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1276 const struct tc_ratespec *conf, 1277 u64 rate64); 1278 1279 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1280 const struct psched_ratecfg *r) 1281 { 1282 memset(res, 0, sizeof(*res)); 1283 1284 /* legacy struct tc_ratespec has a 32bit @rate field 1285 * Qdisc using 64bit rate should add new attributes 1286 * in order to maintain compatibility. 1287 */ 1288 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1289 1290 res->overhead = r->overhead; 1291 res->mpu = r->mpu; 1292 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 1293 } 1294 1295 struct psched_pktrate { 1296 u64 rate_pkts_ps; /* packets per second */ 1297 u32 mult; 1298 u8 shift; 1299 }; 1300 1301 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r, 1302 unsigned int pkt_num) 1303 { 1304 return ((u64)pkt_num * r->mult) >> r->shift; 1305 } 1306 1307 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64); 1308 1309 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 1310 * The fast path only needs to access filter list and to update stats 1311 */ 1312 struct mini_Qdisc { 1313 struct tcf_proto *filter_list; 1314 struct tcf_block *block; 1315 struct gnet_stats_basic_sync __percpu *cpu_bstats; 1316 struct gnet_stats_queue __percpu *cpu_qstats; 1317 unsigned long rcu_state; 1318 }; 1319 1320 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1321 const struct sk_buff *skb) 1322 { 1323 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb); 1324 } 1325 1326 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 1327 { 1328 this_cpu_inc(miniq->cpu_qstats->drops); 1329 } 1330 1331 struct mini_Qdisc_pair { 1332 struct mini_Qdisc miniq1; 1333 struct mini_Qdisc miniq2; 1334 struct mini_Qdisc __rcu **p_miniq; 1335 }; 1336 1337 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1338 struct tcf_proto *tp_head); 1339 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1340 struct mini_Qdisc __rcu **p_miniq); 1341 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, 1342 struct tcf_block *block); 1343 1344 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx); 1345 1346 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 1347 1348 /* Make sure qdisc is no longer in SCHED state. */ 1349 static inline void qdisc_synchronize(const struct Qdisc *q) 1350 { 1351 while (test_bit(__QDISC_STATE_SCHED, &q->state)) 1352 msleep(1); 1353 } 1354 1355 #endif 1356