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 14 struct Qdisc_ops; 15 struct qdisc_walker; 16 struct tcf_walker; 17 struct module; 18 19 struct qdisc_rate_table { 20 struct tc_ratespec rate; 21 u32 data[256]; 22 struct qdisc_rate_table *next; 23 int refcnt; 24 }; 25 26 enum 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 */ 35 enum qdisc___state_t { 36 __QDISC___STATE_RUNNING = 1, 37 }; 38 39 struct 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 47 struct 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 u32 limit; 65 const struct Qdisc_ops *ops; 66 struct qdisc_size_table __rcu *stab; 67 struct list_head list; 68 u32 handle; 69 u32 parent; 70 int (*reshape_fail)(struct sk_buff *skb, 71 struct Qdisc *q); 72 73 void *u32_node; 74 75 /* This field is deprecated, but it is still used by CBQ 76 * and it will live until better solution will be invented. 77 */ 78 struct Qdisc *__parent; 79 struct netdev_queue *dev_queue; 80 81 struct gnet_stats_rate_est64 rate_est; 82 struct Qdisc *next_sched; 83 struct sk_buff *gso_skb; 84 /* 85 * For performance sake on SMP, we put highly modified fields at the end 86 */ 87 unsigned long state; 88 struct sk_buff_head q; 89 union { 90 struct gnet_stats_basic_packed bstats; 91 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 92 } __packed; 93 unsigned int __state; 94 union { 95 struct gnet_stats_queue qstats; 96 struct gnet_stats_queue __percpu *cpu_qstats; 97 } __packed; 98 struct rcu_head rcu_head; 99 int padded; 100 atomic_t refcnt; 101 102 spinlock_t busylock ____cacheline_aligned_in_smp; 103 }; 104 105 static inline bool qdisc_is_running(const struct Qdisc *qdisc) 106 { 107 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false; 108 } 109 110 static 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 } 117 118 static inline void qdisc_run_end(struct Qdisc *qdisc) 119 { 120 qdisc->__state &= ~__QDISC___STATE_RUNNING; 121 } 122 123 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) 124 { 125 return qdisc->flags & TCQ_F_ONETXQUEUE; 126 } 127 128 static 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 } 137 138 static inline bool qdisc_is_throttled(const struct Qdisc *qdisc) 139 { 140 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false; 141 } 142 143 static inline void qdisc_throttled(struct Qdisc *qdisc) 144 { 145 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state); 146 } 147 148 static inline void qdisc_unthrottled(struct Qdisc *qdisc) 149 { 150 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state); 151 } 152 153 struct 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 }; 181 182 struct 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 }; 204 205 206 struct tcf_result { 207 unsigned long class; 208 u32 classid; 209 }; 210 211 struct 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 void (*destroy)(struct tcf_proto*); 220 221 unsigned long (*get)(struct tcf_proto*, u32 handle); 222 void (*put)(struct tcf_proto*, unsigned long); 223 int (*change)(struct net *net, struct sk_buff *, 224 struct tcf_proto*, unsigned long, 225 u32 handle, struct nlattr **, 226 unsigned long *, bool); 227 int (*delete)(struct tcf_proto*, unsigned long); 228 void (*walk)(struct tcf_proto*, struct tcf_walker *arg); 229 230 /* rtnetlink specific */ 231 int (*dump)(struct net*, struct tcf_proto*, unsigned long, 232 struct sk_buff *skb, struct tcmsg*); 233 234 struct module *owner; 235 }; 236 237 struct tcf_proto { 238 /* Fast access part */ 239 struct tcf_proto __rcu *next; 240 void __rcu *root; 241 int (*classify)(struct sk_buff *, 242 const struct tcf_proto *, 243 struct tcf_result *); 244 __be16 protocol; 245 246 /* All the rest */ 247 u32 prio; 248 u32 classid; 249 struct Qdisc *q; 250 void *data; 251 const struct tcf_proto_ops *ops; 252 struct rcu_head rcu; 253 }; 254 255 struct qdisc_skb_cb { 256 unsigned int pkt_len; 257 u16 slave_dev_queue_mapping; 258 u16 _pad; 259 #define QDISC_CB_PRIV_LEN 20 260 unsigned char data[QDISC_CB_PRIV_LEN]; 261 }; 262 263 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 264 { 265 struct qdisc_skb_cb *qcb; 266 267 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); 268 BUILD_BUG_ON(sizeof(qcb->data) < sz); 269 } 270 271 static inline int qdisc_qlen(const struct Qdisc *q) 272 { 273 return q->q.qlen; 274 } 275 276 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 277 { 278 return (struct qdisc_skb_cb *)skb->cb; 279 } 280 281 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 282 { 283 return &qdisc->q.lock; 284 } 285 286 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 287 { 288 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 289 290 return q; 291 } 292 293 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 294 { 295 return qdisc->dev_queue->qdisc_sleeping; 296 } 297 298 /* The qdisc root lock is a mechanism by which to top level 299 * of a qdisc tree can be locked from any qdisc node in the 300 * forest. This allows changing the configuration of some 301 * aspect of the qdisc tree while blocking out asynchronous 302 * qdisc access in the packet processing paths. 303 * 304 * It is only legal to do this when the root will not change 305 * on us. Otherwise we'll potentially lock the wrong qdisc 306 * root. This is enforced by holding the RTNL semaphore, which 307 * all users of this lock accessor must do. 308 */ 309 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) 310 { 311 struct Qdisc *root = qdisc_root(qdisc); 312 313 ASSERT_RTNL(); 314 return qdisc_lock(root); 315 } 316 317 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 318 { 319 struct Qdisc *root = qdisc_root_sleeping(qdisc); 320 321 ASSERT_RTNL(); 322 return qdisc_lock(root); 323 } 324 325 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 326 { 327 return qdisc->dev_queue->dev; 328 } 329 330 static inline void sch_tree_lock(const struct Qdisc *q) 331 { 332 spin_lock_bh(qdisc_root_sleeping_lock(q)); 333 } 334 335 static inline void sch_tree_unlock(const struct Qdisc *q) 336 { 337 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 338 } 339 340 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) 341 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) 342 343 extern struct Qdisc noop_qdisc; 344 extern struct Qdisc_ops noop_qdisc_ops; 345 extern struct Qdisc_ops pfifo_fast_ops; 346 extern struct Qdisc_ops mq_qdisc_ops; 347 extern const struct Qdisc_ops *default_qdisc_ops; 348 349 struct Qdisc_class_common { 350 u32 classid; 351 struct hlist_node hnode; 352 }; 353 354 struct Qdisc_class_hash { 355 struct hlist_head *hash; 356 unsigned int hashsize; 357 unsigned int hashmask; 358 unsigned int hashelems; 359 }; 360 361 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 362 { 363 id ^= id >> 8; 364 id ^= id >> 4; 365 return id & mask; 366 } 367 368 static inline struct Qdisc_class_common * 369 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 370 { 371 struct Qdisc_class_common *cl; 372 unsigned int h; 373 374 h = qdisc_class_hash(id, hash->hashmask); 375 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 376 if (cl->classid == id) 377 return cl; 378 } 379 return NULL; 380 } 381 382 int qdisc_class_hash_init(struct Qdisc_class_hash *); 383 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 384 struct Qdisc_class_common *); 385 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 386 struct Qdisc_class_common *); 387 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 388 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 389 390 void dev_init_scheduler(struct net_device *dev); 391 void dev_shutdown(struct net_device *dev); 392 void dev_activate(struct net_device *dev); 393 void dev_deactivate(struct net_device *dev); 394 void dev_deactivate_many(struct list_head *head); 395 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 396 struct Qdisc *qdisc); 397 void qdisc_reset(struct Qdisc *qdisc); 398 void qdisc_destroy(struct Qdisc *qdisc); 399 void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n); 400 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 401 const struct Qdisc_ops *ops); 402 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 403 const struct Qdisc_ops *ops, u32 parentid); 404 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 405 const struct qdisc_size_table *stab); 406 void tcf_destroy(struct tcf_proto *tp); 407 void tcf_destroy_chain(struct tcf_proto __rcu **fl); 408 409 /* Reset all TX qdiscs greater then index of a device. */ 410 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 411 { 412 struct Qdisc *qdisc; 413 414 for (; i < dev->num_tx_queues; i++) { 415 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 416 if (qdisc) { 417 spin_lock_bh(qdisc_lock(qdisc)); 418 qdisc_reset(qdisc); 419 spin_unlock_bh(qdisc_lock(qdisc)); 420 } 421 } 422 } 423 424 static inline void qdisc_reset_all_tx(struct net_device *dev) 425 { 426 qdisc_reset_all_tx_gt(dev, 0); 427 } 428 429 /* Are all TX queues of the device empty? */ 430 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 431 { 432 unsigned int i; 433 434 rcu_read_lock(); 435 for (i = 0; i < dev->num_tx_queues; i++) { 436 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 437 const struct Qdisc *q = rcu_dereference(txq->qdisc); 438 439 if (q->q.qlen) { 440 rcu_read_unlock(); 441 return false; 442 } 443 } 444 rcu_read_unlock(); 445 return true; 446 } 447 448 /* Are any of the TX qdiscs changing? */ 449 static inline bool qdisc_tx_changing(const struct net_device *dev) 450 { 451 unsigned int i; 452 453 for (i = 0; i < dev->num_tx_queues; i++) { 454 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 455 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) 456 return true; 457 } 458 return false; 459 } 460 461 /* Is the device using the noop qdisc on all queues? */ 462 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 463 { 464 unsigned int i; 465 466 for (i = 0; i < dev->num_tx_queues; i++) { 467 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 468 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 469 return false; 470 } 471 return true; 472 } 473 474 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 475 { 476 return qdisc_skb_cb(skb)->pkt_len; 477 } 478 479 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 480 enum net_xmit_qdisc_t { 481 __NET_XMIT_STOLEN = 0x00010000, 482 __NET_XMIT_BYPASS = 0x00020000, 483 }; 484 485 #ifdef CONFIG_NET_CLS_ACT 486 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 487 #else 488 #define net_xmit_drop_count(e) (1) 489 #endif 490 491 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 492 const struct Qdisc *sch) 493 { 494 #ifdef CONFIG_NET_SCHED 495 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 496 497 if (stab) 498 __qdisc_calculate_pkt_len(skb, stab); 499 #endif 500 } 501 502 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) 503 { 504 qdisc_calculate_pkt_len(skb, sch); 505 return sch->enqueue(skb, sch); 506 } 507 508 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch) 509 { 510 qdisc_skb_cb(skb)->pkt_len = skb->len; 511 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK; 512 } 513 514 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) 515 { 516 return q->flags & TCQ_F_CPUSTATS; 517 } 518 519 static inline void bstats_update(struct gnet_stats_basic_packed *bstats, 520 const struct sk_buff *skb) 521 { 522 bstats->bytes += qdisc_pkt_len(skb); 523 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1; 524 } 525 526 static inline void qdisc_bstats_update_cpu(struct Qdisc *sch, 527 const struct sk_buff *skb) 528 { 529 struct gnet_stats_basic_cpu *bstats = 530 this_cpu_ptr(sch->cpu_bstats); 531 532 u64_stats_update_begin(&bstats->syncp); 533 bstats_update(&bstats->bstats, skb); 534 u64_stats_update_end(&bstats->syncp); 535 } 536 537 static inline void qdisc_bstats_update(struct Qdisc *sch, 538 const struct sk_buff *skb) 539 { 540 bstats_update(&sch->bstats, skb); 541 } 542 543 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 544 const struct sk_buff *skb) 545 { 546 sch->qstats.backlog -= qdisc_pkt_len(skb); 547 } 548 549 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 550 const struct sk_buff *skb) 551 { 552 sch->qstats.backlog += qdisc_pkt_len(skb); 553 } 554 555 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 556 { 557 sch->qstats.drops += count; 558 } 559 560 static inline void qdisc_qstats_drop(struct Qdisc *sch) 561 { 562 sch->qstats.drops++; 563 } 564 565 static inline void qdisc_qstats_drop_cpu(struct Qdisc *sch) 566 { 567 struct gnet_stats_queue *qstats = this_cpu_ptr(sch->cpu_qstats); 568 569 qstats->drops++; 570 } 571 572 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 573 { 574 sch->qstats.overlimits++; 575 } 576 577 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, 578 struct sk_buff_head *list) 579 { 580 __skb_queue_tail(list, skb); 581 qdisc_qstats_backlog_inc(sch, skb); 582 583 return NET_XMIT_SUCCESS; 584 } 585 586 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 587 { 588 return __qdisc_enqueue_tail(skb, sch, &sch->q); 589 } 590 591 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, 592 struct sk_buff_head *list) 593 { 594 struct sk_buff *skb = __skb_dequeue(list); 595 596 if (likely(skb != NULL)) { 597 qdisc_qstats_backlog_dec(sch, skb); 598 qdisc_bstats_update(sch, skb); 599 } 600 601 return skb; 602 } 603 604 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 605 { 606 return __qdisc_dequeue_head(sch, &sch->q); 607 } 608 609 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 610 struct sk_buff_head *list) 611 { 612 struct sk_buff *skb = __skb_dequeue(list); 613 614 if (likely(skb != NULL)) { 615 unsigned int len = qdisc_pkt_len(skb); 616 qdisc_qstats_backlog_dec(sch, skb); 617 kfree_skb(skb); 618 return len; 619 } 620 621 return 0; 622 } 623 624 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch) 625 { 626 return __qdisc_queue_drop_head(sch, &sch->q); 627 } 628 629 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, 630 struct sk_buff_head *list) 631 { 632 struct sk_buff *skb = __skb_dequeue_tail(list); 633 634 if (likely(skb != NULL)) 635 qdisc_qstats_backlog_dec(sch, skb); 636 637 return skb; 638 } 639 640 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) 641 { 642 return __qdisc_dequeue_tail(sch, &sch->q); 643 } 644 645 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 646 { 647 return skb_peek(&sch->q); 648 } 649 650 /* generic pseudo peek method for non-work-conserving qdisc */ 651 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 652 { 653 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 654 if (!sch->gso_skb) { 655 sch->gso_skb = sch->dequeue(sch); 656 if (sch->gso_skb) 657 /* it's still part of the queue */ 658 sch->q.qlen++; 659 } 660 661 return sch->gso_skb; 662 } 663 664 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 665 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 666 { 667 struct sk_buff *skb = sch->gso_skb; 668 669 if (skb) { 670 sch->gso_skb = NULL; 671 sch->q.qlen--; 672 } else { 673 skb = sch->dequeue(sch); 674 } 675 676 return skb; 677 } 678 679 static inline void __qdisc_reset_queue(struct Qdisc *sch, 680 struct sk_buff_head *list) 681 { 682 /* 683 * We do not know the backlog in bytes of this list, it 684 * is up to the caller to correct it 685 */ 686 __skb_queue_purge(list); 687 } 688 689 static inline void qdisc_reset_queue(struct Qdisc *sch) 690 { 691 __qdisc_reset_queue(sch, &sch->q); 692 sch->qstats.backlog = 0; 693 } 694 695 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, 696 struct sk_buff_head *list) 697 { 698 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); 699 700 if (likely(skb != NULL)) { 701 unsigned int len = qdisc_pkt_len(skb); 702 kfree_skb(skb); 703 return len; 704 } 705 706 return 0; 707 } 708 709 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) 710 { 711 return __qdisc_queue_drop(sch, &sch->q); 712 } 713 714 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 715 { 716 kfree_skb(skb); 717 qdisc_qstats_drop(sch); 718 719 return NET_XMIT_DROP; 720 } 721 722 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) 723 { 724 qdisc_qstats_drop(sch); 725 726 #ifdef CONFIG_NET_CLS_ACT 727 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) 728 goto drop; 729 730 return NET_XMIT_SUCCESS; 731 732 drop: 733 #endif 734 kfree_skb(skb); 735 return NET_XMIT_DROP; 736 } 737 738 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how 739 long it will take to send a packet given its size. 740 */ 741 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) 742 { 743 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; 744 if (slot < 0) 745 slot = 0; 746 slot >>= rtab->rate.cell_log; 747 if (slot > 255) 748 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; 749 return rtab->data[slot]; 750 } 751 752 #ifdef CONFIG_NET_CLS_ACT 753 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask, 754 int action) 755 { 756 struct sk_buff *n; 757 758 n = skb_clone(skb, gfp_mask); 759 760 if (n) { 761 n->tc_verd = SET_TC_VERD(n->tc_verd, 0); 762 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd); 763 n->tc_verd = CLR_TC_MUNGED(n->tc_verd); 764 } 765 return n; 766 } 767 #endif 768 769 struct psched_ratecfg { 770 u64 rate_bytes_ps; /* bytes per second */ 771 u32 mult; 772 u16 overhead; 773 u8 linklayer; 774 u8 shift; 775 }; 776 777 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 778 unsigned int len) 779 { 780 len += r->overhead; 781 782 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 783 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 784 785 return ((u64)len * r->mult) >> r->shift; 786 } 787 788 void psched_ratecfg_precompute(struct psched_ratecfg *r, 789 const struct tc_ratespec *conf, 790 u64 rate64); 791 792 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 793 const struct psched_ratecfg *r) 794 { 795 memset(res, 0, sizeof(*res)); 796 797 /* legacy struct tc_ratespec has a 32bit @rate field 798 * Qdisc using 64bit rate should add new attributes 799 * in order to maintain compatibility. 800 */ 801 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 802 803 res->overhead = r->overhead; 804 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 805 } 806 807 #endif 808