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