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 <net/gen_stats.h> 16 #include <net/rtnetlink.h> 17 18 struct Qdisc_ops; 19 struct qdisc_walker; 20 struct tcf_walker; 21 struct module; 22 23 struct qdisc_rate_table { 24 struct tc_ratespec rate; 25 u32 data[256]; 26 struct qdisc_rate_table *next; 27 int refcnt; 28 }; 29 30 enum qdisc_state_t { 31 __QDISC_STATE_SCHED, 32 __QDISC_STATE_DEACTIVATED, 33 }; 34 35 struct qdisc_size_table { 36 struct rcu_head rcu; 37 struct list_head list; 38 struct tc_sizespec szopts; 39 int refcnt; 40 u16 data[]; 41 }; 42 43 /* similar to sk_buff_head, but skb->prev pointer is undefined. */ 44 struct qdisc_skb_head { 45 struct sk_buff *head; 46 struct sk_buff *tail; 47 __u32 qlen; 48 spinlock_t lock; 49 }; 50 51 struct Qdisc { 52 int (*enqueue)(struct sk_buff *skb, 53 struct Qdisc *sch, 54 struct sk_buff **to_free); 55 struct sk_buff * (*dequeue)(struct Qdisc *sch); 56 unsigned int flags; 57 #define TCQ_F_BUILTIN 1 58 #define TCQ_F_INGRESS 2 59 #define TCQ_F_CAN_BYPASS 4 60 #define TCQ_F_MQROOT 8 61 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for 62 * q->dev_queue : It can test 63 * netif_xmit_frozen_or_stopped() before 64 * dequeueing next packet. 65 * Its true for MQ/MQPRIO slaves, or non 66 * multiqueue device. 67 */ 68 #define TCQ_F_WARN_NONWC (1 << 16) 69 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ 70 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : 71 * qdisc_tree_decrease_qlen() should stop. 72 */ 73 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ 74 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ 75 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ 76 u32 limit; 77 const struct Qdisc_ops *ops; 78 struct qdisc_size_table __rcu *stab; 79 struct hlist_node hash; 80 u32 handle; 81 u32 parent; 82 83 struct netdev_queue *dev_queue; 84 85 struct net_rate_estimator __rcu *rate_est; 86 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 87 struct gnet_stats_queue __percpu *cpu_qstats; 88 89 /* 90 * For performance sake on SMP, we put highly modified fields at the end 91 */ 92 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; 93 struct qdisc_skb_head q; 94 struct gnet_stats_basic_packed bstats; 95 seqcount_t running; 96 struct gnet_stats_queue qstats; 97 unsigned long state; 98 struct Qdisc *next_sched; 99 struct sk_buff_head skb_bad_txq; 100 int padded; 101 refcount_t refcnt; 102 103 spinlock_t busylock ____cacheline_aligned_in_smp; 104 }; 105 106 static inline void qdisc_refcount_inc(struct Qdisc *qdisc) 107 { 108 if (qdisc->flags & TCQ_F_BUILTIN) 109 return; 110 refcount_inc(&qdisc->refcnt); 111 } 112 113 static inline bool qdisc_is_running(const struct Qdisc *qdisc) 114 { 115 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; 116 } 117 118 static inline bool qdisc_run_begin(struct Qdisc *qdisc) 119 { 120 if (qdisc_is_running(qdisc)) 121 return false; 122 /* Variant of write_seqcount_begin() telling lockdep a trylock 123 * was attempted. 124 */ 125 raw_write_seqcount_begin(&qdisc->running); 126 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); 127 return true; 128 } 129 130 static inline void qdisc_run_end(struct Qdisc *qdisc) 131 { 132 write_seqcount_end(&qdisc->running); 133 } 134 135 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) 136 { 137 return qdisc->flags & TCQ_F_ONETXQUEUE; 138 } 139 140 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) 141 { 142 #ifdef CONFIG_BQL 143 /* Non-BQL migrated drivers will return 0, too. */ 144 return dql_avail(&txq->dql); 145 #else 146 return 0; 147 #endif 148 } 149 150 struct Qdisc_class_ops { 151 /* Child qdisc manipulation */ 152 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); 153 int (*graft)(struct Qdisc *, unsigned long cl, 154 struct Qdisc *, struct Qdisc **); 155 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); 156 void (*qlen_notify)(struct Qdisc *, unsigned long); 157 158 /* Class manipulation routines */ 159 unsigned long (*find)(struct Qdisc *, u32 classid); 160 int (*change)(struct Qdisc *, u32, u32, 161 struct nlattr **, unsigned long *, 162 struct netlink_ext_ack *); 163 int (*delete)(struct Qdisc *, unsigned long); 164 void (*walk)(struct Qdisc *, struct qdisc_walker * arg); 165 166 /* Filter manipulation */ 167 struct tcf_block * (*tcf_block)(struct Qdisc *sch, 168 unsigned long arg, 169 struct netlink_ext_ack *extack); 170 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, 171 u32 classid); 172 void (*unbind_tcf)(struct Qdisc *, unsigned long); 173 174 /* rtnetlink specific */ 175 int (*dump)(struct Qdisc *, unsigned long, 176 struct sk_buff *skb, struct tcmsg*); 177 int (*dump_stats)(struct Qdisc *, unsigned long, 178 struct gnet_dump *); 179 }; 180 181 struct Qdisc_ops { 182 struct Qdisc_ops *next; 183 const struct Qdisc_class_ops *cl_ops; 184 char id[IFNAMSIZ]; 185 int priv_size; 186 unsigned int static_flags; 187 188 int (*enqueue)(struct sk_buff *skb, 189 struct Qdisc *sch, 190 struct sk_buff **to_free); 191 struct sk_buff * (*dequeue)(struct Qdisc *); 192 struct sk_buff * (*peek)(struct Qdisc *); 193 194 int (*init)(struct Qdisc *sch, struct nlattr *arg, 195 struct netlink_ext_ack *extack); 196 void (*reset)(struct Qdisc *); 197 void (*destroy)(struct Qdisc *); 198 int (*change)(struct Qdisc *sch, 199 struct nlattr *arg, 200 struct netlink_ext_ack *extack); 201 void (*attach)(struct Qdisc *sch); 202 203 int (*dump)(struct Qdisc *, struct sk_buff *); 204 int (*dump_stats)(struct Qdisc *, struct gnet_dump *); 205 206 struct module *owner; 207 }; 208 209 210 struct tcf_result { 211 union { 212 struct { 213 unsigned long class; 214 u32 classid; 215 }; 216 const struct tcf_proto *goto_tp; 217 }; 218 }; 219 220 struct tcf_proto_ops { 221 struct list_head head; 222 char kind[IFNAMSIZ]; 223 224 int (*classify)(struct sk_buff *, 225 const struct tcf_proto *, 226 struct tcf_result *); 227 int (*init)(struct tcf_proto*); 228 void (*destroy)(struct tcf_proto*); 229 230 void* (*get)(struct tcf_proto*, u32 handle); 231 int (*change)(struct net *net, struct sk_buff *, 232 struct tcf_proto*, unsigned long, 233 u32 handle, struct nlattr **, 234 void **, bool); 235 int (*delete)(struct tcf_proto*, void *, bool*); 236 void (*walk)(struct tcf_proto*, struct tcf_walker *arg); 237 void (*bind_class)(void *, u32, unsigned long); 238 239 /* rtnetlink specific */ 240 int (*dump)(struct net*, struct tcf_proto*, void *, 241 struct sk_buff *skb, struct tcmsg*); 242 243 struct module *owner; 244 }; 245 246 struct tcf_proto { 247 /* Fast access part */ 248 struct tcf_proto __rcu *next; 249 void __rcu *root; 250 int (*classify)(struct sk_buff *, 251 const struct tcf_proto *, 252 struct tcf_result *); 253 __be16 protocol; 254 255 /* All the rest */ 256 u32 prio; 257 u32 classid; 258 struct Qdisc *q; 259 void *data; 260 const struct tcf_proto_ops *ops; 261 struct tcf_chain *chain; 262 struct rcu_head rcu; 263 }; 264 265 struct qdisc_skb_cb { 266 unsigned int pkt_len; 267 u16 slave_dev_queue_mapping; 268 u16 tc_classid; 269 #define QDISC_CB_PRIV_LEN 20 270 unsigned char data[QDISC_CB_PRIV_LEN]; 271 }; 272 273 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); 274 275 struct tcf_chain { 276 struct tcf_proto __rcu *filter_chain; 277 tcf_chain_head_change_t *chain_head_change; 278 void *chain_head_change_priv; 279 struct list_head list; 280 struct tcf_block *block; 281 u32 index; /* chain index */ 282 unsigned int refcnt; 283 }; 284 285 struct tcf_block { 286 struct list_head chain_list; 287 struct net *net; 288 struct Qdisc *q; 289 struct list_head cb_list; 290 }; 291 292 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 293 { 294 struct qdisc_skb_cb *qcb; 295 296 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); 297 BUILD_BUG_ON(sizeof(qcb->data) < sz); 298 } 299 300 static inline int qdisc_qlen_cpu(const struct Qdisc *q) 301 { 302 return this_cpu_ptr(q->cpu_qstats)->qlen; 303 } 304 305 static inline int qdisc_qlen(const struct Qdisc *q) 306 { 307 return q->q.qlen; 308 } 309 310 static inline int qdisc_qlen_sum(const struct Qdisc *q) 311 { 312 __u32 qlen = 0; 313 int i; 314 315 if (q->flags & TCQ_F_NOLOCK) { 316 for_each_possible_cpu(i) 317 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; 318 } else { 319 qlen = q->q.qlen; 320 } 321 322 return qlen; 323 } 324 325 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 326 { 327 return (struct qdisc_skb_cb *)skb->cb; 328 } 329 330 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 331 { 332 return &qdisc->q.lock; 333 } 334 335 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 336 { 337 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 338 339 return q; 340 } 341 342 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 343 { 344 return qdisc->dev_queue->qdisc_sleeping; 345 } 346 347 /* The qdisc root lock is a mechanism by which to top level 348 * of a qdisc tree can be locked from any qdisc node in the 349 * forest. This allows changing the configuration of some 350 * aspect of the qdisc tree while blocking out asynchronous 351 * qdisc access in the packet processing paths. 352 * 353 * It is only legal to do this when the root will not change 354 * on us. Otherwise we'll potentially lock the wrong qdisc 355 * root. This is enforced by holding the RTNL semaphore, which 356 * all users of this lock accessor must do. 357 */ 358 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) 359 { 360 struct Qdisc *root = qdisc_root(qdisc); 361 362 ASSERT_RTNL(); 363 return qdisc_lock(root); 364 } 365 366 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 367 { 368 struct Qdisc *root = qdisc_root_sleeping(qdisc); 369 370 ASSERT_RTNL(); 371 return qdisc_lock(root); 372 } 373 374 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) 375 { 376 struct Qdisc *root = qdisc_root_sleeping(qdisc); 377 378 ASSERT_RTNL(); 379 return &root->running; 380 } 381 382 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 383 { 384 return qdisc->dev_queue->dev; 385 } 386 387 static inline void sch_tree_lock(const struct Qdisc *q) 388 { 389 spin_lock_bh(qdisc_root_sleeping_lock(q)); 390 } 391 392 static inline void sch_tree_unlock(const struct Qdisc *q) 393 { 394 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 395 } 396 397 extern struct Qdisc noop_qdisc; 398 extern struct Qdisc_ops noop_qdisc_ops; 399 extern struct Qdisc_ops pfifo_fast_ops; 400 extern struct Qdisc_ops mq_qdisc_ops; 401 extern struct Qdisc_ops noqueue_qdisc_ops; 402 extern const struct Qdisc_ops *default_qdisc_ops; 403 static inline const struct Qdisc_ops * 404 get_default_qdisc_ops(const struct net_device *dev, int ntx) 405 { 406 return ntx < dev->real_num_tx_queues ? 407 default_qdisc_ops : &pfifo_fast_ops; 408 } 409 410 struct Qdisc_class_common { 411 u32 classid; 412 struct hlist_node hnode; 413 }; 414 415 struct Qdisc_class_hash { 416 struct hlist_head *hash; 417 unsigned int hashsize; 418 unsigned int hashmask; 419 unsigned int hashelems; 420 }; 421 422 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 423 { 424 id ^= id >> 8; 425 id ^= id >> 4; 426 return id & mask; 427 } 428 429 static inline struct Qdisc_class_common * 430 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 431 { 432 struct Qdisc_class_common *cl; 433 unsigned int h; 434 435 if (!id) 436 return NULL; 437 438 h = qdisc_class_hash(id, hash->hashmask); 439 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 440 if (cl->classid == id) 441 return cl; 442 } 443 return NULL; 444 } 445 446 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 447 { 448 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 449 450 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 451 } 452 453 int qdisc_class_hash_init(struct Qdisc_class_hash *); 454 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 455 struct Qdisc_class_common *); 456 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 457 struct Qdisc_class_common *); 458 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 459 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 460 461 void dev_init_scheduler(struct net_device *dev); 462 void dev_shutdown(struct net_device *dev); 463 void dev_activate(struct net_device *dev); 464 void dev_deactivate(struct net_device *dev); 465 void dev_deactivate_many(struct list_head *head); 466 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 467 struct Qdisc *qdisc); 468 void qdisc_reset(struct Qdisc *qdisc); 469 void qdisc_destroy(struct Qdisc *qdisc); 470 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, 471 unsigned int len); 472 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 473 const struct Qdisc_ops *ops); 474 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 475 const struct Qdisc_ops *ops, u32 parentid); 476 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 477 const struct qdisc_size_table *stab); 478 int skb_do_redirect(struct sk_buff *); 479 480 static inline void skb_reset_tc(struct sk_buff *skb) 481 { 482 #ifdef CONFIG_NET_CLS_ACT 483 skb->tc_redirected = 0; 484 #endif 485 } 486 487 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 488 { 489 #ifdef CONFIG_NET_CLS_ACT 490 return skb->tc_at_ingress; 491 #else 492 return false; 493 #endif 494 } 495 496 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 497 { 498 #ifdef CONFIG_NET_CLS_ACT 499 if (skb->tc_skip_classify) { 500 skb->tc_skip_classify = 0; 501 return true; 502 } 503 #endif 504 return false; 505 } 506 507 /* Reset all TX qdiscs greater then index of a device. */ 508 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 509 { 510 struct Qdisc *qdisc; 511 512 for (; i < dev->num_tx_queues; i++) { 513 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 514 if (qdisc) { 515 spin_lock_bh(qdisc_lock(qdisc)); 516 qdisc_reset(qdisc); 517 spin_unlock_bh(qdisc_lock(qdisc)); 518 } 519 } 520 } 521 522 static inline void qdisc_reset_all_tx(struct net_device *dev) 523 { 524 qdisc_reset_all_tx_gt(dev, 0); 525 } 526 527 /* Are all TX queues of the device empty? */ 528 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 529 { 530 unsigned int i; 531 532 rcu_read_lock(); 533 for (i = 0; i < dev->num_tx_queues; i++) { 534 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 535 const struct Qdisc *q = rcu_dereference(txq->qdisc); 536 537 if (q->q.qlen) { 538 rcu_read_unlock(); 539 return false; 540 } 541 } 542 rcu_read_unlock(); 543 return true; 544 } 545 546 /* Are any of the TX qdiscs changing? */ 547 static inline bool qdisc_tx_changing(const struct net_device *dev) 548 { 549 unsigned int i; 550 551 for (i = 0; i < dev->num_tx_queues; i++) { 552 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 553 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) 554 return true; 555 } 556 return false; 557 } 558 559 /* Is the device using the noop qdisc on all queues? */ 560 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 561 { 562 unsigned int i; 563 564 for (i = 0; i < dev->num_tx_queues; i++) { 565 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 566 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 567 return false; 568 } 569 return true; 570 } 571 572 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 573 { 574 return qdisc_skb_cb(skb)->pkt_len; 575 } 576 577 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 578 enum net_xmit_qdisc_t { 579 __NET_XMIT_STOLEN = 0x00010000, 580 __NET_XMIT_BYPASS = 0x00020000, 581 }; 582 583 #ifdef CONFIG_NET_CLS_ACT 584 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 585 #else 586 #define net_xmit_drop_count(e) (1) 587 #endif 588 589 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 590 const struct Qdisc *sch) 591 { 592 #ifdef CONFIG_NET_SCHED 593 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 594 595 if (stab) 596 __qdisc_calculate_pkt_len(skb, stab); 597 #endif 598 } 599 600 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 601 struct sk_buff **to_free) 602 { 603 qdisc_calculate_pkt_len(skb, sch); 604 return sch->enqueue(skb, sch, to_free); 605 } 606 607 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) 608 { 609 return q->flags & TCQ_F_CPUSTATS; 610 } 611 612 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, 613 __u64 bytes, __u32 packets) 614 { 615 bstats->bytes += bytes; 616 bstats->packets += packets; 617 } 618 619 static inline void bstats_update(struct gnet_stats_basic_packed *bstats, 620 const struct sk_buff *skb) 621 { 622 _bstats_update(bstats, 623 qdisc_pkt_len(skb), 624 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); 625 } 626 627 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, 628 __u64 bytes, __u32 packets) 629 { 630 u64_stats_update_begin(&bstats->syncp); 631 _bstats_update(&bstats->bstats, bytes, packets); 632 u64_stats_update_end(&bstats->syncp); 633 } 634 635 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, 636 const struct sk_buff *skb) 637 { 638 u64_stats_update_begin(&bstats->syncp); 639 bstats_update(&bstats->bstats, skb); 640 u64_stats_update_end(&bstats->syncp); 641 } 642 643 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 644 const struct sk_buff *skb) 645 { 646 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); 647 } 648 649 static inline void qdisc_bstats_update(struct Qdisc *sch, 650 const struct sk_buff *skb) 651 { 652 bstats_update(&sch->bstats, skb); 653 } 654 655 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 656 const struct sk_buff *skb) 657 { 658 sch->qstats.backlog -= qdisc_pkt_len(skb); 659 } 660 661 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 662 const struct sk_buff *skb) 663 { 664 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 665 } 666 667 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 668 const struct sk_buff *skb) 669 { 670 sch->qstats.backlog += qdisc_pkt_len(skb); 671 } 672 673 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 674 const struct sk_buff *skb) 675 { 676 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 677 } 678 679 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 680 { 681 this_cpu_inc(sch->cpu_qstats->qlen); 682 } 683 684 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 685 { 686 this_cpu_dec(sch->cpu_qstats->qlen); 687 } 688 689 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 690 { 691 this_cpu_inc(sch->cpu_qstats->requeues); 692 } 693 694 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 695 { 696 sch->qstats.drops += count; 697 } 698 699 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 700 { 701 qstats->drops++; 702 } 703 704 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 705 { 706 qstats->overlimits++; 707 } 708 709 static inline void qdisc_qstats_drop(struct Qdisc *sch) 710 { 711 qstats_drop_inc(&sch->qstats); 712 } 713 714 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 715 { 716 this_cpu_inc(sch->cpu_qstats->drops); 717 } 718 719 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 720 { 721 sch->qstats.overlimits++; 722 } 723 724 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) 725 { 726 qh->head = NULL; 727 qh->tail = NULL; 728 qh->qlen = 0; 729 } 730 731 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, 732 struct qdisc_skb_head *qh) 733 { 734 struct sk_buff *last = qh->tail; 735 736 if (last) { 737 skb->next = NULL; 738 last->next = skb; 739 qh->tail = skb; 740 } else { 741 qh->tail = skb; 742 qh->head = skb; 743 } 744 qh->qlen++; 745 qdisc_qstats_backlog_inc(sch, skb); 746 747 return NET_XMIT_SUCCESS; 748 } 749 750 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 751 { 752 return __qdisc_enqueue_tail(skb, sch, &sch->q); 753 } 754 755 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 756 { 757 struct sk_buff *skb = qh->head; 758 759 if (likely(skb != NULL)) { 760 qh->head = skb->next; 761 qh->qlen--; 762 if (qh->head == NULL) 763 qh->tail = NULL; 764 skb->next = NULL; 765 } 766 767 return skb; 768 } 769 770 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 771 { 772 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 773 774 if (likely(skb != NULL)) { 775 qdisc_qstats_backlog_dec(sch, skb); 776 qdisc_bstats_update(sch, skb); 777 } 778 779 return skb; 780 } 781 782 /* Instead of calling kfree_skb() while root qdisc lock is held, 783 * queue the skb for future freeing at end of __dev_xmit_skb() 784 */ 785 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 786 { 787 skb->next = *to_free; 788 *to_free = skb; 789 } 790 791 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 792 struct qdisc_skb_head *qh, 793 struct sk_buff **to_free) 794 { 795 struct sk_buff *skb = __qdisc_dequeue_head(qh); 796 797 if (likely(skb != NULL)) { 798 unsigned int len = qdisc_pkt_len(skb); 799 800 qdisc_qstats_backlog_dec(sch, skb); 801 __qdisc_drop(skb, to_free); 802 return len; 803 } 804 805 return 0; 806 } 807 808 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, 809 struct sk_buff **to_free) 810 { 811 return __qdisc_queue_drop_head(sch, &sch->q, to_free); 812 } 813 814 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 815 { 816 const struct qdisc_skb_head *qh = &sch->q; 817 818 return qh->head; 819 } 820 821 /* generic pseudo peek method for non-work-conserving qdisc */ 822 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 823 { 824 struct sk_buff *skb = skb_peek(&sch->gso_skb); 825 826 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 827 if (!skb) { 828 skb = sch->dequeue(sch); 829 830 if (skb) { 831 __skb_queue_head(&sch->gso_skb, skb); 832 /* it's still part of the queue */ 833 qdisc_qstats_backlog_inc(sch, skb); 834 sch->q.qlen++; 835 } 836 } 837 838 return skb; 839 } 840 841 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 842 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 843 { 844 struct sk_buff *skb = skb_peek(&sch->gso_skb); 845 846 if (skb) { 847 skb = __skb_dequeue(&sch->gso_skb); 848 qdisc_qstats_backlog_dec(sch, skb); 849 sch->q.qlen--; 850 } else { 851 skb = sch->dequeue(sch); 852 } 853 854 return skb; 855 } 856 857 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 858 { 859 /* 860 * We do not know the backlog in bytes of this list, it 861 * is up to the caller to correct it 862 */ 863 ASSERT_RTNL(); 864 if (qh->qlen) { 865 rtnl_kfree_skbs(qh->head, qh->tail); 866 867 qh->head = NULL; 868 qh->tail = NULL; 869 qh->qlen = 0; 870 } 871 } 872 873 static inline void qdisc_reset_queue(struct Qdisc *sch) 874 { 875 __qdisc_reset_queue(&sch->q); 876 sch->qstats.backlog = 0; 877 } 878 879 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 880 struct Qdisc **pold) 881 { 882 struct Qdisc *old; 883 884 sch_tree_lock(sch); 885 old = *pold; 886 *pold = new; 887 if (old != NULL) { 888 unsigned int qlen = old->q.qlen; 889 unsigned int backlog = old->qstats.backlog; 890 891 qdisc_reset(old); 892 qdisc_tree_reduce_backlog(old, qlen, backlog); 893 } 894 sch_tree_unlock(sch); 895 896 return old; 897 } 898 899 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 900 { 901 rtnl_kfree_skbs(skb, skb); 902 qdisc_qstats_drop(sch); 903 } 904 905 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 906 struct sk_buff **to_free) 907 { 908 __qdisc_drop(skb, to_free); 909 qdisc_qstats_cpu_drop(sch); 910 911 return NET_XMIT_DROP; 912 } 913 914 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 915 struct sk_buff **to_free) 916 { 917 __qdisc_drop(skb, to_free); 918 qdisc_qstats_drop(sch); 919 920 return NET_XMIT_DROP; 921 } 922 923 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how 924 long it will take to send a packet given its size. 925 */ 926 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) 927 { 928 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; 929 if (slot < 0) 930 slot = 0; 931 slot >>= rtab->rate.cell_log; 932 if (slot > 255) 933 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; 934 return rtab->data[slot]; 935 } 936 937 struct psched_ratecfg { 938 u64 rate_bytes_ps; /* bytes per second */ 939 u32 mult; 940 u16 overhead; 941 u8 linklayer; 942 u8 shift; 943 }; 944 945 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 946 unsigned int len) 947 { 948 len += r->overhead; 949 950 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 951 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 952 953 return ((u64)len * r->mult) >> r->shift; 954 } 955 956 void psched_ratecfg_precompute(struct psched_ratecfg *r, 957 const struct tc_ratespec *conf, 958 u64 rate64); 959 960 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 961 const struct psched_ratecfg *r) 962 { 963 memset(res, 0, sizeof(*res)); 964 965 /* legacy struct tc_ratespec has a 32bit @rate field 966 * Qdisc using 64bit rate should add new attributes 967 * in order to maintain compatibility. 968 */ 969 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 970 971 res->overhead = r->overhead; 972 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 973 } 974 975 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 976 * The fast path only needs to access filter list and to update stats 977 */ 978 struct mini_Qdisc { 979 struct tcf_proto *filter_list; 980 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 981 struct gnet_stats_queue __percpu *cpu_qstats; 982 struct rcu_head rcu; 983 }; 984 985 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 986 const struct sk_buff *skb) 987 { 988 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb); 989 } 990 991 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 992 { 993 this_cpu_inc(miniq->cpu_qstats->drops); 994 } 995 996 struct mini_Qdisc_pair { 997 struct mini_Qdisc miniq1; 998 struct mini_Qdisc miniq2; 999 struct mini_Qdisc __rcu **p_miniq; 1000 }; 1001 1002 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1003 struct tcf_proto *tp_head); 1004 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1005 struct mini_Qdisc __rcu **p_miniq); 1006 1007 #endif 1008