1#ifndef __NET_SCHED_GENERIC_H 2#define __NET_SCHED_GENERIC_H 3 4#include <linux/netdevice.h> 5#include <linux/types.h> 6#include <linux/rcupdate.h> 7#include <linux/pkt_sched.h> 8#include <linux/pkt_cls.h> 9#include <linux/percpu.h> 10#include <linux/dynamic_queue_limits.h> 11#include <net/gen_stats.h> 12#include <net/rtnetlink.h> 13 14struct Qdisc_ops; 15struct qdisc_walker; 16struct tcf_walker; 17struct module; 18 19struct qdisc_rate_table { 20 struct tc_ratespec rate; 21 u32 data[256]; 22 struct qdisc_rate_table *next; 23 int refcnt; 24}; 25 26enum qdisc_state_t { 27 __QDISC_STATE_SCHED, 28 __QDISC_STATE_DEACTIVATED, 29 __QDISC_STATE_THROTTLED, 30}; 31 32/* 33 * following bits are only changed while qdisc lock is held 34 */ 35enum qdisc___state_t { 36 __QDISC___STATE_RUNNING = 1, 37}; 38 39struct qdisc_size_table { 40 struct rcu_head rcu; 41 struct list_head list; 42 struct tc_sizespec szopts; 43 int refcnt; 44 u16 data[]; 45}; 46 47struct Qdisc { 48 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev); 49 struct sk_buff * (*dequeue)(struct Qdisc *dev); 50 unsigned int flags; 51#define TCQ_F_BUILTIN 1 52#define TCQ_F_INGRESS 2 53#define TCQ_F_CAN_BYPASS 4 54#define TCQ_F_MQROOT 8 55#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for 56 * q->dev_queue : It can test 57 * netif_xmit_frozen_or_stopped() before 58 * dequeueing next packet. 59 * Its true for MQ/MQPRIO slaves, or non 60 * multiqueue device. 61 */ 62#define TCQ_F_WARN_NONWC (1 << 16) 63#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ 64#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : 65 * qdisc_tree_decrease_qlen() should stop. 66 */ 67 u32 limit; 68 const struct Qdisc_ops *ops; 69 struct qdisc_size_table __rcu *stab; 70 struct list_head list; 71 u32 handle; 72 u32 parent; 73 int (*reshape_fail)(struct sk_buff *skb, 74 struct Qdisc *q); 75 76 void *u32_node; 77 78 /* This field is deprecated, but it is still used by CBQ 79 * and it will live until better solution will be invented. 80 */ 81 struct Qdisc *__parent; 82 struct netdev_queue *dev_queue; 83 84 struct gnet_stats_rate_est64 rate_est; 85 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 86 struct gnet_stats_queue __percpu *cpu_qstats; 87 88 struct Qdisc *next_sched; 89 struct sk_buff *gso_skb; 90 /* 91 * For performance sake on SMP, we put highly modified fields at the end 92 */ 93 unsigned long state; 94 struct sk_buff_head q; 95 struct gnet_stats_basic_packed bstats; 96 unsigned int __state; 97 struct gnet_stats_queue qstats; 98 struct rcu_head rcu_head; 99 int padded; 100 atomic_t refcnt; 101 102 spinlock_t busylock ____cacheline_aligned_in_smp; 103}; 104 105static inline bool qdisc_is_running(const struct Qdisc *qdisc) 106{ 107 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false; 108} 109 110static inline bool qdisc_run_begin(struct Qdisc *qdisc) 111{ 112 if (qdisc_is_running(qdisc)) 113 return false; 114 qdisc->__state |= __QDISC___STATE_RUNNING; 115 return true; 116} 117 118static inline void qdisc_run_end(struct Qdisc *qdisc) 119{ 120 qdisc->__state &= ~__QDISC___STATE_RUNNING; 121} 122 123static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) 124{ 125 return qdisc->flags & TCQ_F_ONETXQUEUE; 126} 127 128static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) 129{ 130#ifdef CONFIG_BQL 131 /* Non-BQL migrated drivers will return 0, too. */ 132 return dql_avail(&txq->dql); 133#else 134 return 0; 135#endif 136} 137 138static inline bool qdisc_is_throttled(const struct Qdisc *qdisc) 139{ 140 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false; 141} 142 143static inline void qdisc_throttled(struct Qdisc *qdisc) 144{ 145 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state); 146} 147 148static inline void qdisc_unthrottled(struct Qdisc *qdisc) 149{ 150 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state); 151} 152 153struct Qdisc_class_ops { 154 /* Child qdisc manipulation */ 155 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); 156 int (*graft)(struct Qdisc *, unsigned long cl, 157 struct Qdisc *, struct Qdisc **); 158 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); 159 void (*qlen_notify)(struct Qdisc *, unsigned long); 160 161 /* Class manipulation routines */ 162 unsigned long (*get)(struct Qdisc *, u32 classid); 163 void (*put)(struct Qdisc *, unsigned long); 164 int (*change)(struct Qdisc *, u32, u32, 165 struct nlattr **, unsigned long *); 166 int (*delete)(struct Qdisc *, unsigned long); 167 void (*walk)(struct Qdisc *, struct qdisc_walker * arg); 168 169 /* Filter manipulation */ 170 struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long); 171 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, 172 u32 classid); 173 void (*unbind_tcf)(struct Qdisc *, unsigned long); 174 175 /* rtnetlink specific */ 176 int (*dump)(struct Qdisc *, unsigned long, 177 struct sk_buff *skb, struct tcmsg*); 178 int (*dump_stats)(struct Qdisc *, unsigned long, 179 struct gnet_dump *); 180}; 181 182struct Qdisc_ops { 183 struct Qdisc_ops *next; 184 const struct Qdisc_class_ops *cl_ops; 185 char id[IFNAMSIZ]; 186 int priv_size; 187 188 int (*enqueue)(struct sk_buff *, struct Qdisc *); 189 struct sk_buff * (*dequeue)(struct Qdisc *); 190 struct sk_buff * (*peek)(struct Qdisc *); 191 unsigned int (*drop)(struct Qdisc *); 192 193 int (*init)(struct Qdisc *, struct nlattr *arg); 194 void (*reset)(struct Qdisc *); 195 void (*destroy)(struct Qdisc *); 196 int (*change)(struct Qdisc *, struct nlattr *arg); 197 void (*attach)(struct Qdisc *); 198 199 int (*dump)(struct Qdisc *, struct sk_buff *); 200 int (*dump_stats)(struct Qdisc *, struct gnet_dump *); 201 202 struct module *owner; 203}; 204 205 206struct tcf_result { 207 unsigned long class; 208 u32 classid; 209}; 210 211struct tcf_proto_ops { 212 struct list_head head; 213 char kind[IFNAMSIZ]; 214 215 int (*classify)(struct sk_buff *, 216 const struct tcf_proto *, 217 struct tcf_result *); 218 int (*init)(struct tcf_proto*); 219 bool (*destroy)(struct tcf_proto*, bool); 220 221 unsigned long (*get)(struct tcf_proto*, u32 handle); 222 int (*change)(struct net *net, struct sk_buff *, 223 struct tcf_proto*, unsigned long, 224 u32 handle, struct nlattr **, 225 unsigned long *, bool); 226 int (*delete)(struct tcf_proto*, unsigned long); 227 void (*walk)(struct tcf_proto*, struct tcf_walker *arg); 228 229 /* rtnetlink specific */ 230 int (*dump)(struct net*, struct tcf_proto*, unsigned long, 231 struct sk_buff *skb, struct tcmsg*); 232 233 struct module *owner; 234}; 235 236struct tcf_proto { 237 /* Fast access part */ 238 struct tcf_proto __rcu *next; 239 void __rcu *root; 240 int (*classify)(struct sk_buff *, 241 const struct tcf_proto *, 242 struct tcf_result *); 243 __be16 protocol; 244 245 /* All the rest */ 246 u32 prio; 247 u32 classid; 248 struct Qdisc *q; 249 void *data; 250 const struct tcf_proto_ops *ops; 251 struct rcu_head rcu; 252}; 253 254struct qdisc_skb_cb { 255 unsigned int pkt_len; 256 u16 slave_dev_queue_mapping; 257 u16 _pad; 258#define QDISC_CB_PRIV_LEN 20 259 unsigned char data[QDISC_CB_PRIV_LEN]; 260}; 261 262static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 263{ 264 struct qdisc_skb_cb *qcb; 265 266 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); 267 BUILD_BUG_ON(sizeof(qcb->data) < sz); 268} 269 270static inline int qdisc_qlen(const struct Qdisc *q) 271{ 272 return q->q.qlen; 273} 274 275static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 276{ 277 return (struct qdisc_skb_cb *)skb->cb; 278} 279 280static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 281{ 282 return &qdisc->q.lock; 283} 284 285static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 286{ 287 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 288 289 return q; 290} 291 292static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 293{ 294 return qdisc->dev_queue->qdisc_sleeping; 295} 296 297/* The qdisc root lock is a mechanism by which to top level 298 * of a qdisc tree can be locked from any qdisc node in the 299 * forest. This allows changing the configuration of some 300 * aspect of the qdisc tree while blocking out asynchronous 301 * qdisc access in the packet processing paths. 302 * 303 * It is only legal to do this when the root will not change 304 * on us. Otherwise we'll potentially lock the wrong qdisc 305 * root. This is enforced by holding the RTNL semaphore, which 306 * all users of this lock accessor must do. 307 */ 308static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) 309{ 310 struct Qdisc *root = qdisc_root(qdisc); 311 312 ASSERT_RTNL(); 313 return qdisc_lock(root); 314} 315 316static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 317{ 318 struct Qdisc *root = qdisc_root_sleeping(qdisc); 319 320 ASSERT_RTNL(); 321 return qdisc_lock(root); 322} 323 324static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 325{ 326 return qdisc->dev_queue->dev; 327} 328 329static inline void sch_tree_lock(const struct Qdisc *q) 330{ 331 spin_lock_bh(qdisc_root_sleeping_lock(q)); 332} 333 334static inline void sch_tree_unlock(const struct Qdisc *q) 335{ 336 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 337} 338 339#define tcf_tree_lock(tp) sch_tree_lock((tp)->q) 340#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) 341 342extern struct Qdisc noop_qdisc; 343extern struct Qdisc_ops noop_qdisc_ops; 344extern struct Qdisc_ops pfifo_fast_ops; 345extern struct Qdisc_ops mq_qdisc_ops; 346extern const struct Qdisc_ops *default_qdisc_ops; 347 348struct Qdisc_class_common { 349 u32 classid; 350 struct hlist_node hnode; 351}; 352 353struct Qdisc_class_hash { 354 struct hlist_head *hash; 355 unsigned int hashsize; 356 unsigned int hashmask; 357 unsigned int hashelems; 358}; 359 360static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 361{ 362 id ^= id >> 8; 363 id ^= id >> 4; 364 return id & mask; 365} 366 367static inline struct Qdisc_class_common * 368qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 369{ 370 struct Qdisc_class_common *cl; 371 unsigned int h; 372 373 h = qdisc_class_hash(id, hash->hashmask); 374 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 375 if (cl->classid == id) 376 return cl; 377 } 378 return NULL; 379} 380 381int qdisc_class_hash_init(struct Qdisc_class_hash *); 382void qdisc_class_hash_insert(struct Qdisc_class_hash *, 383 struct Qdisc_class_common *); 384void qdisc_class_hash_remove(struct Qdisc_class_hash *, 385 struct Qdisc_class_common *); 386void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 387void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 388 389void dev_init_scheduler(struct net_device *dev); 390void dev_shutdown(struct net_device *dev); 391void dev_activate(struct net_device *dev); 392void dev_deactivate(struct net_device *dev); 393void dev_deactivate_many(struct list_head *head); 394struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 395 struct Qdisc *qdisc); 396void qdisc_reset(struct Qdisc *qdisc); 397void qdisc_destroy(struct Qdisc *qdisc); 398void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n); 399struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 400 const struct Qdisc_ops *ops); 401struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 402 const struct Qdisc_ops *ops, u32 parentid); 403void __qdisc_calculate_pkt_len(struct sk_buff *skb, 404 const struct qdisc_size_table *stab); 405bool tcf_destroy(struct tcf_proto *tp, bool force); 406void tcf_destroy_chain(struct tcf_proto __rcu **fl); 407 408/* Reset all TX qdiscs greater then index of a device. */ 409static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 410{ 411 struct Qdisc *qdisc; 412 413 for (; i < dev->num_tx_queues; i++) { 414 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 415 if (qdisc) { 416 spin_lock_bh(qdisc_lock(qdisc)); 417 qdisc_reset(qdisc); 418 spin_unlock_bh(qdisc_lock(qdisc)); 419 } 420 } 421} 422 423static inline void qdisc_reset_all_tx(struct net_device *dev) 424{ 425 qdisc_reset_all_tx_gt(dev, 0); 426} 427 428/* Are all TX queues of the device empty? */ 429static inline bool qdisc_all_tx_empty(const struct net_device *dev) 430{ 431 unsigned int i; 432 433 rcu_read_lock(); 434 for (i = 0; i < dev->num_tx_queues; i++) { 435 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 436 const struct Qdisc *q = rcu_dereference(txq->qdisc); 437 438 if (q->q.qlen) { 439 rcu_read_unlock(); 440 return false; 441 } 442 } 443 rcu_read_unlock(); 444 return true; 445} 446 447/* Are any of the TX qdiscs changing? */ 448static inline bool qdisc_tx_changing(const struct net_device *dev) 449{ 450 unsigned int i; 451 452 for (i = 0; i < dev->num_tx_queues; i++) { 453 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 454 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) 455 return true; 456 } 457 return false; 458} 459 460/* Is the device using the noop qdisc on all queues? */ 461static inline bool qdisc_tx_is_noop(const struct net_device *dev) 462{ 463 unsigned int i; 464 465 for (i = 0; i < dev->num_tx_queues; i++) { 466 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 467 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 468 return false; 469 } 470 return true; 471} 472 473static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 474{ 475 return qdisc_skb_cb(skb)->pkt_len; 476} 477 478/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 479enum net_xmit_qdisc_t { 480 __NET_XMIT_STOLEN = 0x00010000, 481 __NET_XMIT_BYPASS = 0x00020000, 482}; 483 484#ifdef CONFIG_NET_CLS_ACT 485#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 486#else 487#define net_xmit_drop_count(e) (1) 488#endif 489 490static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 491 const struct Qdisc *sch) 492{ 493#ifdef CONFIG_NET_SCHED 494 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 495 496 if (stab) 497 __qdisc_calculate_pkt_len(skb, stab); 498#endif 499} 500 501static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) 502{ 503 qdisc_calculate_pkt_len(skb, sch); 504 return sch->enqueue(skb, sch); 505} 506 507static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch) 508{ 509 qdisc_skb_cb(skb)->pkt_len = skb->len; 510 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK; 511} 512 513static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) 514{ 515 return q->flags & TCQ_F_CPUSTATS; 516} 517 518static inline void bstats_update(struct gnet_stats_basic_packed *bstats, 519 const struct sk_buff *skb) 520{ 521 bstats->bytes += qdisc_pkt_len(skb); 522 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1; 523} 524 525static inline void qdisc_bstats_update_cpu(struct Qdisc *sch, 526 const struct sk_buff *skb) 527{ 528 struct gnet_stats_basic_cpu *bstats = 529 this_cpu_ptr(sch->cpu_bstats); 530 531 u64_stats_update_begin(&bstats->syncp); 532 bstats_update(&bstats->bstats, skb); 533 u64_stats_update_end(&bstats->syncp); 534} 535 536static inline void qdisc_bstats_update(struct Qdisc *sch, 537 const struct sk_buff *skb) 538{ 539 bstats_update(&sch->bstats, skb); 540} 541 542static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 543 const struct sk_buff *skb) 544{ 545 sch->qstats.backlog -= qdisc_pkt_len(skb); 546} 547 548static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 549 const struct sk_buff *skb) 550{ 551 sch->qstats.backlog += qdisc_pkt_len(skb); 552} 553 554static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 555{ 556 sch->qstats.drops += count; 557} 558 559static inline void qdisc_qstats_drop(struct Qdisc *sch) 560{ 561 sch->qstats.drops++; 562} 563 564static inline void qdisc_qstats_drop_cpu(struct Qdisc *sch) 565{ 566 struct gnet_stats_queue *qstats = this_cpu_ptr(sch->cpu_qstats); 567 568 qstats->drops++; 569} 570 571static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 572{ 573 sch->qstats.overlimits++; 574} 575 576static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, 577 struct sk_buff_head *list) 578{ 579 __skb_queue_tail(list, skb); 580 qdisc_qstats_backlog_inc(sch, skb); 581 582 return NET_XMIT_SUCCESS; 583} 584 585static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 586{ 587 return __qdisc_enqueue_tail(skb, sch, &sch->q); 588} 589 590static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, 591 struct sk_buff_head *list) 592{ 593 struct sk_buff *skb = __skb_dequeue(list); 594 595 if (likely(skb != NULL)) { 596 qdisc_qstats_backlog_dec(sch, skb); 597 qdisc_bstats_update(sch, skb); 598 } 599 600 return skb; 601} 602 603static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 604{ 605 return __qdisc_dequeue_head(sch, &sch->q); 606} 607 608static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 609 struct sk_buff_head *list) 610{ 611 struct sk_buff *skb = __skb_dequeue(list); 612 613 if (likely(skb != NULL)) { 614 unsigned int len = qdisc_pkt_len(skb); 615 qdisc_qstats_backlog_dec(sch, skb); 616 kfree_skb(skb); 617 return len; 618 } 619 620 return 0; 621} 622 623static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch) 624{ 625 return __qdisc_queue_drop_head(sch, &sch->q); 626} 627 628static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, 629 struct sk_buff_head *list) 630{ 631 struct sk_buff *skb = __skb_dequeue_tail(list); 632 633 if (likely(skb != NULL)) 634 qdisc_qstats_backlog_dec(sch, skb); 635 636 return skb; 637} 638 639static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) 640{ 641 return __qdisc_dequeue_tail(sch, &sch->q); 642} 643 644static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 645{ 646 return skb_peek(&sch->q); 647} 648 649/* generic pseudo peek method for non-work-conserving qdisc */ 650static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 651{ 652 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 653 if (!sch->gso_skb) { 654 sch->gso_skb = sch->dequeue(sch); 655 if (sch->gso_skb) 656 /* it's still part of the queue */ 657 sch->q.qlen++; 658 } 659 660 return sch->gso_skb; 661} 662 663/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 664static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 665{ 666 struct sk_buff *skb = sch->gso_skb; 667 668 if (skb) { 669 sch->gso_skb = NULL; 670 sch->q.qlen--; 671 } else { 672 skb = sch->dequeue(sch); 673 } 674 675 return skb; 676} 677 678static inline void __qdisc_reset_queue(struct Qdisc *sch, 679 struct sk_buff_head *list) 680{ 681 /* 682 * We do not know the backlog in bytes of this list, it 683 * is up to the caller to correct it 684 */ 685 __skb_queue_purge(list); 686} 687 688static inline void qdisc_reset_queue(struct Qdisc *sch) 689{ 690 __qdisc_reset_queue(sch, &sch->q); 691 sch->qstats.backlog = 0; 692} 693 694static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, 695 struct sk_buff_head *list) 696{ 697 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); 698 699 if (likely(skb != NULL)) { 700 unsigned int len = qdisc_pkt_len(skb); 701 kfree_skb(skb); 702 return len; 703 } 704 705 return 0; 706} 707 708static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) 709{ 710 return __qdisc_queue_drop(sch, &sch->q); 711} 712 713static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 714{ 715 kfree_skb(skb); 716 qdisc_qstats_drop(sch); 717 718 return NET_XMIT_DROP; 719} 720 721static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) 722{ 723 qdisc_qstats_drop(sch); 724 725#ifdef CONFIG_NET_CLS_ACT 726 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) 727 goto drop; 728 729 return NET_XMIT_SUCCESS; 730 731drop: 732#endif 733 kfree_skb(skb); 734 return NET_XMIT_DROP; 735} 736 737/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how 738 long it will take to send a packet given its size. 739 */ 740static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) 741{ 742 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; 743 if (slot < 0) 744 slot = 0; 745 slot >>= rtab->rate.cell_log; 746 if (slot > 255) 747 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; 748 return rtab->data[slot]; 749} 750 751#ifdef CONFIG_NET_CLS_ACT 752static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask, 753 int action) 754{ 755 struct sk_buff *n; 756 757 n = skb_clone(skb, gfp_mask); 758 759 if (n) { 760 n->tc_verd = SET_TC_VERD(n->tc_verd, 0); 761 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd); 762 n->tc_verd = CLR_TC_MUNGED(n->tc_verd); 763 } 764 return n; 765} 766#endif 767 768struct psched_ratecfg { 769 u64 rate_bytes_ps; /* bytes per second */ 770 u32 mult; 771 u16 overhead; 772 u8 linklayer; 773 u8 shift; 774}; 775 776static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 777 unsigned int len) 778{ 779 len += r->overhead; 780 781 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 782 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 783 784 return ((u64)len * r->mult) >> r->shift; 785} 786 787void psched_ratecfg_precompute(struct psched_ratecfg *r, 788 const struct tc_ratespec *conf, 789 u64 rate64); 790 791static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 792 const struct psched_ratecfg *r) 793{ 794 memset(res, 0, sizeof(*res)); 795 796 /* legacy struct tc_ratespec has a 32bit @rate field 797 * Qdisc using 64bit rate should add new attributes 798 * in order to maintain compatibility. 799 */ 800 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 801 802 res->overhead = r->overhead; 803 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 804} 805 806#endif 807