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 23 struct Qdisc_ops; 24 struct qdisc_walker; 25 struct tcf_walker; 26 struct module; 27 struct bpf_flow_keys; 28 29 struct qdisc_rate_table { 30 struct tc_ratespec rate; 31 u32 data[256]; 32 struct qdisc_rate_table *next; 33 int refcnt; 34 }; 35 36 enum qdisc_state_t { 37 __QDISC_STATE_SCHED, 38 __QDISC_STATE_DEACTIVATED, 39 }; 40 41 struct qdisc_size_table { 42 struct rcu_head rcu; 43 struct list_head list; 44 struct tc_sizespec szopts; 45 int refcnt; 46 u16 data[]; 47 }; 48 49 /* similar to sk_buff_head, but skb->prev pointer is undefined. */ 50 struct qdisc_skb_head { 51 struct sk_buff *head; 52 struct sk_buff *tail; 53 __u32 qlen; 54 spinlock_t lock; 55 }; 56 57 struct Qdisc { 58 int (*enqueue)(struct sk_buff *skb, 59 struct Qdisc *sch, 60 struct sk_buff **to_free); 61 struct sk_buff * (*dequeue)(struct Qdisc *sch); 62 unsigned int flags; 63 #define TCQ_F_BUILTIN 1 64 #define TCQ_F_INGRESS 2 65 #define TCQ_F_CAN_BYPASS 4 66 #define TCQ_F_MQROOT 8 67 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for 68 * q->dev_queue : It can test 69 * netif_xmit_frozen_or_stopped() before 70 * dequeueing next packet. 71 * Its true for MQ/MQPRIO slaves, or non 72 * multiqueue device. 73 */ 74 #define TCQ_F_WARN_NONWC (1 << 16) 75 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ 76 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : 77 * qdisc_tree_decrease_qlen() should stop. 78 */ 79 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ 80 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ 81 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ 82 u32 limit; 83 const struct Qdisc_ops *ops; 84 struct qdisc_size_table __rcu *stab; 85 struct hlist_node hash; 86 u32 handle; 87 u32 parent; 88 89 struct netdev_queue *dev_queue; 90 91 struct net_rate_estimator __rcu *rate_est; 92 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 93 struct gnet_stats_queue __percpu *cpu_qstats; 94 int padded; 95 refcount_t refcnt; 96 97 /* 98 * For performance sake on SMP, we put highly modified fields at the end 99 */ 100 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; 101 struct qdisc_skb_head q; 102 struct gnet_stats_basic_packed bstats; 103 seqcount_t running; 104 struct gnet_stats_queue qstats; 105 unsigned long state; 106 struct Qdisc *next_sched; 107 struct sk_buff_head skb_bad_txq; 108 109 spinlock_t busylock ____cacheline_aligned_in_smp; 110 spinlock_t seqlock; 111 112 /* for NOLOCK qdisc, true if there are no enqueued skbs */ 113 bool empty; 114 struct rcu_head rcu; 115 }; 116 117 static inline void qdisc_refcount_inc(struct Qdisc *qdisc) 118 { 119 if (qdisc->flags & TCQ_F_BUILTIN) 120 return; 121 refcount_inc(&qdisc->refcnt); 122 } 123 124 /* Intended to be used by unlocked users, when concurrent qdisc release is 125 * possible. 126 */ 127 128 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) 129 { 130 if (qdisc->flags & TCQ_F_BUILTIN) 131 return qdisc; 132 if (refcount_inc_not_zero(&qdisc->refcnt)) 133 return qdisc; 134 return NULL; 135 } 136 137 static inline bool qdisc_is_running(struct Qdisc *qdisc) 138 { 139 if (qdisc->flags & TCQ_F_NOLOCK) 140 return spin_is_locked(&qdisc->seqlock); 141 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; 142 } 143 144 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) 145 { 146 return q->flags & TCQ_F_CPUSTATS; 147 } 148 149 static inline bool qdisc_is_empty(const struct Qdisc *qdisc) 150 { 151 if (qdisc_is_percpu_stats(qdisc)) 152 return READ_ONCE(qdisc->empty); 153 return !READ_ONCE(qdisc->q.qlen); 154 } 155 156 static inline bool qdisc_run_begin(struct Qdisc *qdisc) 157 { 158 if (qdisc->flags & TCQ_F_NOLOCK) { 159 if (!spin_trylock(&qdisc->seqlock)) 160 return false; 161 WRITE_ONCE(qdisc->empty, false); 162 } else if (qdisc_is_running(qdisc)) { 163 return false; 164 } 165 /* Variant of write_seqcount_begin() telling lockdep a trylock 166 * was attempted. 167 */ 168 raw_write_seqcount_begin(&qdisc->running); 169 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); 170 return true; 171 } 172 173 static inline void qdisc_run_end(struct Qdisc *qdisc) 174 { 175 write_seqcount_end(&qdisc->running); 176 if (qdisc->flags & TCQ_F_NOLOCK) 177 spin_unlock(&qdisc->seqlock); 178 } 179 180 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) 181 { 182 return qdisc->flags & TCQ_F_ONETXQUEUE; 183 } 184 185 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) 186 { 187 #ifdef CONFIG_BQL 188 /* Non-BQL migrated drivers will return 0, too. */ 189 return dql_avail(&txq->dql); 190 #else 191 return 0; 192 #endif 193 } 194 195 struct Qdisc_class_ops { 196 unsigned int flags; 197 /* Child qdisc manipulation */ 198 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); 199 int (*graft)(struct Qdisc *, unsigned long cl, 200 struct Qdisc *, struct Qdisc **, 201 struct netlink_ext_ack *extack); 202 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); 203 void (*qlen_notify)(struct Qdisc *, unsigned long); 204 205 /* Class manipulation routines */ 206 unsigned long (*find)(struct Qdisc *, u32 classid); 207 int (*change)(struct Qdisc *, u32, u32, 208 struct nlattr **, unsigned long *, 209 struct netlink_ext_ack *); 210 int (*delete)(struct Qdisc *, unsigned long); 211 void (*walk)(struct Qdisc *, struct qdisc_walker * arg); 212 213 /* Filter manipulation */ 214 struct tcf_block * (*tcf_block)(struct Qdisc *sch, 215 unsigned long arg, 216 struct netlink_ext_ack *extack); 217 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, 218 u32 classid); 219 void (*unbind_tcf)(struct Qdisc *, unsigned long); 220 221 /* rtnetlink specific */ 222 int (*dump)(struct Qdisc *, unsigned long, 223 struct sk_buff *skb, struct tcmsg*); 224 int (*dump_stats)(struct Qdisc *, unsigned long, 225 struct gnet_dump *); 226 }; 227 228 /* Qdisc_class_ops flag values */ 229 230 /* Implements API that doesn't require rtnl lock */ 231 enum qdisc_class_ops_flags { 232 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, 233 }; 234 235 struct Qdisc_ops { 236 struct Qdisc_ops *next; 237 const struct Qdisc_class_ops *cl_ops; 238 char id[IFNAMSIZ]; 239 int priv_size; 240 unsigned int static_flags; 241 242 int (*enqueue)(struct sk_buff *skb, 243 struct Qdisc *sch, 244 struct sk_buff **to_free); 245 struct sk_buff * (*dequeue)(struct Qdisc *); 246 struct sk_buff * (*peek)(struct Qdisc *); 247 248 int (*init)(struct Qdisc *sch, struct nlattr *arg, 249 struct netlink_ext_ack *extack); 250 void (*reset)(struct Qdisc *); 251 void (*destroy)(struct Qdisc *); 252 int (*change)(struct Qdisc *sch, 253 struct nlattr *arg, 254 struct netlink_ext_ack *extack); 255 void (*attach)(struct Qdisc *sch); 256 int (*change_tx_queue_len)(struct Qdisc *, unsigned int); 257 258 int (*dump)(struct Qdisc *, struct sk_buff *); 259 int (*dump_stats)(struct Qdisc *, struct gnet_dump *); 260 261 void (*ingress_block_set)(struct Qdisc *sch, 262 u32 block_index); 263 void (*egress_block_set)(struct Qdisc *sch, 264 u32 block_index); 265 u32 (*ingress_block_get)(struct Qdisc *sch); 266 u32 (*egress_block_get)(struct Qdisc *sch); 267 268 struct module *owner; 269 }; 270 271 272 struct tcf_result { 273 union { 274 struct { 275 unsigned long class; 276 u32 classid; 277 }; 278 const struct tcf_proto *goto_tp; 279 280 /* used in the skb_tc_reinsert function */ 281 struct { 282 bool ingress; 283 struct gnet_stats_queue *qstats; 284 }; 285 }; 286 }; 287 288 struct tcf_chain; 289 290 struct tcf_proto_ops { 291 struct list_head head; 292 char kind[IFNAMSIZ]; 293 294 int (*classify)(struct sk_buff *, 295 const struct tcf_proto *, 296 struct tcf_result *); 297 int (*init)(struct tcf_proto*); 298 void (*destroy)(struct tcf_proto *tp, bool rtnl_held, 299 struct netlink_ext_ack *extack); 300 301 void* (*get)(struct tcf_proto*, u32 handle); 302 void (*put)(struct tcf_proto *tp, void *f); 303 int (*change)(struct net *net, struct sk_buff *, 304 struct tcf_proto*, unsigned long, 305 u32 handle, struct nlattr **, 306 void **, bool, bool, 307 struct netlink_ext_ack *); 308 int (*delete)(struct tcf_proto *tp, void *arg, 309 bool *last, bool rtnl_held, 310 struct netlink_ext_ack *); 311 bool (*delete_empty)(struct tcf_proto *tp); 312 void (*walk)(struct tcf_proto *tp, 313 struct tcf_walker *arg, bool rtnl_held); 314 int (*reoffload)(struct tcf_proto *tp, bool add, 315 flow_setup_cb_t *cb, void *cb_priv, 316 struct netlink_ext_ack *extack); 317 void (*hw_add)(struct tcf_proto *tp, 318 void *type_data); 319 void (*hw_del)(struct tcf_proto *tp, 320 void *type_data); 321 void (*bind_class)(void *, u32, unsigned long, 322 void *, unsigned long); 323 void * (*tmplt_create)(struct net *net, 324 struct tcf_chain *chain, 325 struct nlattr **tca, 326 struct netlink_ext_ack *extack); 327 void (*tmplt_destroy)(void *tmplt_priv); 328 329 /* rtnetlink specific */ 330 int (*dump)(struct net*, struct tcf_proto*, void *, 331 struct sk_buff *skb, struct tcmsg*, 332 bool); 333 int (*tmplt_dump)(struct sk_buff *skb, 334 struct net *net, 335 void *tmplt_priv); 336 337 struct module *owner; 338 int flags; 339 }; 340 341 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags 342 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race 343 * conditions can occur when filters are inserted/deleted simultaneously. 344 */ 345 enum tcf_proto_ops_flags { 346 TCF_PROTO_OPS_DOIT_UNLOCKED = 1, 347 }; 348 349 struct tcf_proto { 350 /* Fast access part */ 351 struct tcf_proto __rcu *next; 352 void __rcu *root; 353 354 /* called under RCU BH lock*/ 355 int (*classify)(struct sk_buff *, 356 const struct tcf_proto *, 357 struct tcf_result *); 358 __be16 protocol; 359 360 /* All the rest */ 361 u32 prio; 362 void *data; 363 const struct tcf_proto_ops *ops; 364 struct tcf_chain *chain; 365 /* Lock protects tcf_proto shared state and can be used by unlocked 366 * classifiers to protect their private data. 367 */ 368 spinlock_t lock; 369 bool deleting; 370 refcount_t refcnt; 371 struct rcu_head rcu; 372 struct hlist_node destroy_ht_node; 373 }; 374 375 struct qdisc_skb_cb { 376 struct { 377 unsigned int pkt_len; 378 u16 slave_dev_queue_mapping; 379 u16 tc_classid; 380 }; 381 #define QDISC_CB_PRIV_LEN 20 382 unsigned char data[QDISC_CB_PRIV_LEN]; 383 }; 384 385 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); 386 387 struct tcf_chain { 388 /* Protects filter_chain. */ 389 struct mutex filter_chain_lock; 390 struct tcf_proto __rcu *filter_chain; 391 struct list_head list; 392 struct tcf_block *block; 393 u32 index; /* chain index */ 394 unsigned int refcnt; 395 unsigned int action_refcnt; 396 bool explicitly_created; 397 bool flushing; 398 const struct tcf_proto_ops *tmplt_ops; 399 void *tmplt_priv; 400 struct rcu_head rcu; 401 }; 402 403 struct tcf_block { 404 /* Lock protects tcf_block and lifetime-management data of chains 405 * attached to the block (refcnt, action_refcnt, explicitly_created). 406 */ 407 struct mutex lock; 408 struct list_head chain_list; 409 u32 index; /* block index for shared blocks */ 410 refcount_t refcnt; 411 struct net *net; 412 struct Qdisc *q; 413 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */ 414 struct flow_block flow_block; 415 struct list_head owner_list; 416 bool keep_dst; 417 atomic_t offloadcnt; /* Number of oddloaded filters */ 418 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ 419 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ 420 struct { 421 struct tcf_chain *chain; 422 struct list_head filter_chain_list; 423 } chain0; 424 struct rcu_head rcu; 425 DECLARE_HASHTABLE(proto_destroy_ht, 7); 426 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ 427 }; 428 429 #ifdef CONFIG_PROVE_LOCKING 430 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) 431 { 432 return lockdep_is_held(&chain->filter_chain_lock); 433 } 434 435 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) 436 { 437 return lockdep_is_held(&tp->lock); 438 } 439 #else 440 static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain) 441 { 442 return true; 443 } 444 445 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) 446 { 447 return true; 448 } 449 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 450 451 #define tcf_chain_dereference(p, chain) \ 452 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) 453 454 #define tcf_proto_dereference(p, tp) \ 455 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) 456 457 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 458 { 459 struct qdisc_skb_cb *qcb; 460 461 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); 462 BUILD_BUG_ON(sizeof(qcb->data) < sz); 463 } 464 465 static inline int qdisc_qlen_cpu(const struct Qdisc *q) 466 { 467 return this_cpu_ptr(q->cpu_qstats)->qlen; 468 } 469 470 static inline int qdisc_qlen(const struct Qdisc *q) 471 { 472 return q->q.qlen; 473 } 474 475 static inline int qdisc_qlen_sum(const struct Qdisc *q) 476 { 477 __u32 qlen = q->qstats.qlen; 478 int i; 479 480 if (qdisc_is_percpu_stats(q)) { 481 for_each_possible_cpu(i) 482 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; 483 } else { 484 qlen += q->q.qlen; 485 } 486 487 return qlen; 488 } 489 490 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 491 { 492 return (struct qdisc_skb_cb *)skb->cb; 493 } 494 495 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 496 { 497 return &qdisc->q.lock; 498 } 499 500 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 501 { 502 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 503 504 return q; 505 } 506 507 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) 508 { 509 return rcu_dereference_bh(qdisc->dev_queue->qdisc); 510 } 511 512 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 513 { 514 return qdisc->dev_queue->qdisc_sleeping; 515 } 516 517 /* The qdisc root lock is a mechanism by which to top level 518 * of a qdisc tree can be locked from any qdisc node in the 519 * forest. This allows changing the configuration of some 520 * aspect of the qdisc tree while blocking out asynchronous 521 * qdisc access in the packet processing paths. 522 * 523 * It is only legal to do this when the root will not change 524 * on us. Otherwise we'll potentially lock the wrong qdisc 525 * root. This is enforced by holding the RTNL semaphore, which 526 * all users of this lock accessor must do. 527 */ 528 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) 529 { 530 struct Qdisc *root = qdisc_root(qdisc); 531 532 ASSERT_RTNL(); 533 return qdisc_lock(root); 534 } 535 536 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 537 { 538 struct Qdisc *root = qdisc_root_sleeping(qdisc); 539 540 ASSERT_RTNL(); 541 return qdisc_lock(root); 542 } 543 544 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) 545 { 546 struct Qdisc *root = qdisc_root_sleeping(qdisc); 547 548 ASSERT_RTNL(); 549 return &root->running; 550 } 551 552 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 553 { 554 return qdisc->dev_queue->dev; 555 } 556 557 static inline void sch_tree_lock(const struct Qdisc *q) 558 { 559 spin_lock_bh(qdisc_root_sleeping_lock(q)); 560 } 561 562 static inline void sch_tree_unlock(const struct Qdisc *q) 563 { 564 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 565 } 566 567 extern struct Qdisc noop_qdisc; 568 extern struct Qdisc_ops noop_qdisc_ops; 569 extern struct Qdisc_ops pfifo_fast_ops; 570 extern struct Qdisc_ops mq_qdisc_ops; 571 extern struct Qdisc_ops noqueue_qdisc_ops; 572 extern const struct Qdisc_ops *default_qdisc_ops; 573 static inline const struct Qdisc_ops * 574 get_default_qdisc_ops(const struct net_device *dev, int ntx) 575 { 576 return ntx < dev->real_num_tx_queues ? 577 default_qdisc_ops : &pfifo_fast_ops; 578 } 579 580 struct Qdisc_class_common { 581 u32 classid; 582 struct hlist_node hnode; 583 }; 584 585 struct Qdisc_class_hash { 586 struct hlist_head *hash; 587 unsigned int hashsize; 588 unsigned int hashmask; 589 unsigned int hashelems; 590 }; 591 592 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 593 { 594 id ^= id >> 8; 595 id ^= id >> 4; 596 return id & mask; 597 } 598 599 static inline struct Qdisc_class_common * 600 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 601 { 602 struct Qdisc_class_common *cl; 603 unsigned int h; 604 605 if (!id) 606 return NULL; 607 608 h = qdisc_class_hash(id, hash->hashmask); 609 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 610 if (cl->classid == id) 611 return cl; 612 } 613 return NULL; 614 } 615 616 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 617 { 618 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 619 620 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 621 } 622 623 int qdisc_class_hash_init(struct Qdisc_class_hash *); 624 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 625 struct Qdisc_class_common *); 626 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 627 struct Qdisc_class_common *); 628 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 629 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 630 631 int dev_qdisc_change_tx_queue_len(struct net_device *dev); 632 void dev_init_scheduler(struct net_device *dev); 633 void dev_shutdown(struct net_device *dev); 634 void dev_activate(struct net_device *dev); 635 void dev_deactivate(struct net_device *dev); 636 void dev_deactivate_many(struct list_head *head); 637 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 638 struct Qdisc *qdisc); 639 void qdisc_reset(struct Qdisc *qdisc); 640 void qdisc_put(struct Qdisc *qdisc); 641 void qdisc_put_unlocked(struct Qdisc *qdisc); 642 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); 643 #ifdef CONFIG_NET_SCHED 644 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 645 void *type_data); 646 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 647 struct Qdisc *new, struct Qdisc *old, 648 enum tc_setup_type type, void *type_data, 649 struct netlink_ext_ack *extack); 650 #else 651 static inline int 652 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 653 void *type_data) 654 { 655 q->flags &= ~TCQ_F_OFFLOADED; 656 return 0; 657 } 658 659 static inline void 660 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 661 struct Qdisc *new, struct Qdisc *old, 662 enum tc_setup_type type, void *type_data, 663 struct netlink_ext_ack *extack) 664 { 665 } 666 #endif 667 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 668 const struct Qdisc_ops *ops, 669 struct netlink_ext_ack *extack); 670 void qdisc_free(struct Qdisc *qdisc); 671 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 672 const struct Qdisc_ops *ops, u32 parentid, 673 struct netlink_ext_ack *extack); 674 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 675 const struct qdisc_size_table *stab); 676 int skb_do_redirect(struct sk_buff *); 677 678 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 679 { 680 #ifdef CONFIG_NET_CLS_ACT 681 return skb->tc_at_ingress; 682 #else 683 return false; 684 #endif 685 } 686 687 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 688 { 689 #ifdef CONFIG_NET_CLS_ACT 690 if (skb->tc_skip_classify) { 691 skb->tc_skip_classify = 0; 692 return true; 693 } 694 #endif 695 return false; 696 } 697 698 /* Reset all TX qdiscs greater than index of a device. */ 699 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 700 { 701 struct Qdisc *qdisc; 702 703 for (; i < dev->num_tx_queues; i++) { 704 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 705 if (qdisc) { 706 spin_lock_bh(qdisc_lock(qdisc)); 707 qdisc_reset(qdisc); 708 spin_unlock_bh(qdisc_lock(qdisc)); 709 } 710 } 711 } 712 713 /* Are all TX queues of the device empty? */ 714 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 715 { 716 unsigned int i; 717 718 rcu_read_lock(); 719 for (i = 0; i < dev->num_tx_queues; i++) { 720 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 721 const struct Qdisc *q = rcu_dereference(txq->qdisc); 722 723 if (!qdisc_is_empty(q)) { 724 rcu_read_unlock(); 725 return false; 726 } 727 } 728 rcu_read_unlock(); 729 return true; 730 } 731 732 /* Are any of the TX qdiscs changing? */ 733 static inline bool qdisc_tx_changing(const struct net_device *dev) 734 { 735 unsigned int i; 736 737 for (i = 0; i < dev->num_tx_queues; i++) { 738 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 739 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) 740 return true; 741 } 742 return false; 743 } 744 745 /* Is the device using the noop qdisc on all queues? */ 746 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 747 { 748 unsigned int i; 749 750 for (i = 0; i < dev->num_tx_queues; i++) { 751 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 752 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 753 return false; 754 } 755 return true; 756 } 757 758 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 759 { 760 return qdisc_skb_cb(skb)->pkt_len; 761 } 762 763 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 764 enum net_xmit_qdisc_t { 765 __NET_XMIT_STOLEN = 0x00010000, 766 __NET_XMIT_BYPASS = 0x00020000, 767 }; 768 769 #ifdef CONFIG_NET_CLS_ACT 770 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 771 #else 772 #define net_xmit_drop_count(e) (1) 773 #endif 774 775 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 776 const struct Qdisc *sch) 777 { 778 #ifdef CONFIG_NET_SCHED 779 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 780 781 if (stab) 782 __qdisc_calculate_pkt_len(skb, stab); 783 #endif 784 } 785 786 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 787 struct sk_buff **to_free) 788 { 789 qdisc_calculate_pkt_len(skb, sch); 790 return sch->enqueue(skb, sch, to_free); 791 } 792 793 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, 794 __u64 bytes, __u32 packets) 795 { 796 bstats->bytes += bytes; 797 bstats->packets += packets; 798 } 799 800 static inline void bstats_update(struct gnet_stats_basic_packed *bstats, 801 const struct sk_buff *skb) 802 { 803 _bstats_update(bstats, 804 qdisc_pkt_len(skb), 805 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); 806 } 807 808 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, 809 __u64 bytes, __u32 packets) 810 { 811 u64_stats_update_begin(&bstats->syncp); 812 _bstats_update(&bstats->bstats, bytes, packets); 813 u64_stats_update_end(&bstats->syncp); 814 } 815 816 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, 817 const struct sk_buff *skb) 818 { 819 u64_stats_update_begin(&bstats->syncp); 820 bstats_update(&bstats->bstats, skb); 821 u64_stats_update_end(&bstats->syncp); 822 } 823 824 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 825 const struct sk_buff *skb) 826 { 827 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); 828 } 829 830 static inline void qdisc_bstats_update(struct Qdisc *sch, 831 const struct sk_buff *skb) 832 { 833 bstats_update(&sch->bstats, skb); 834 } 835 836 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 837 const struct sk_buff *skb) 838 { 839 sch->qstats.backlog -= qdisc_pkt_len(skb); 840 } 841 842 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 843 const struct sk_buff *skb) 844 { 845 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 846 } 847 848 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 849 const struct sk_buff *skb) 850 { 851 sch->qstats.backlog += qdisc_pkt_len(skb); 852 } 853 854 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 855 const struct sk_buff *skb) 856 { 857 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 858 } 859 860 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 861 { 862 this_cpu_inc(sch->cpu_qstats->qlen); 863 } 864 865 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 866 { 867 this_cpu_dec(sch->cpu_qstats->qlen); 868 } 869 870 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 871 { 872 this_cpu_inc(sch->cpu_qstats->requeues); 873 } 874 875 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 876 { 877 sch->qstats.drops += count; 878 } 879 880 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 881 { 882 qstats->drops++; 883 } 884 885 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 886 { 887 qstats->overlimits++; 888 } 889 890 static inline void qdisc_qstats_drop(struct Qdisc *sch) 891 { 892 qstats_drop_inc(&sch->qstats); 893 } 894 895 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 896 { 897 this_cpu_inc(sch->cpu_qstats->drops); 898 } 899 900 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 901 { 902 sch->qstats.overlimits++; 903 } 904 905 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) 906 { 907 __u32 qlen = qdisc_qlen_sum(sch); 908 909 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); 910 } 911 912 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, 913 __u32 *backlog) 914 { 915 struct gnet_stats_queue qstats = { 0 }; 916 __u32 len = qdisc_qlen_sum(sch); 917 918 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len); 919 *qlen = qstats.qlen; 920 *backlog = qstats.backlog; 921 } 922 923 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch) 924 { 925 __u32 qlen, backlog; 926 927 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 928 qdisc_tree_reduce_backlog(sch, qlen, backlog); 929 } 930 931 static inline void qdisc_purge_queue(struct Qdisc *sch) 932 { 933 __u32 qlen, backlog; 934 935 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 936 qdisc_reset(sch); 937 qdisc_tree_reduce_backlog(sch, qlen, backlog); 938 } 939 940 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) 941 { 942 qh->head = NULL; 943 qh->tail = NULL; 944 qh->qlen = 0; 945 } 946 947 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 948 struct qdisc_skb_head *qh) 949 { 950 struct sk_buff *last = qh->tail; 951 952 if (last) { 953 skb->next = NULL; 954 last->next = skb; 955 qh->tail = skb; 956 } else { 957 qh->tail = skb; 958 qh->head = skb; 959 } 960 qh->qlen++; 961 } 962 963 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 964 { 965 __qdisc_enqueue_tail(skb, &sch->q); 966 qdisc_qstats_backlog_inc(sch, skb); 967 return NET_XMIT_SUCCESS; 968 } 969 970 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 971 struct qdisc_skb_head *qh) 972 { 973 skb->next = qh->head; 974 975 if (!qh->head) 976 qh->tail = skb; 977 qh->head = skb; 978 qh->qlen++; 979 } 980 981 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 982 { 983 struct sk_buff *skb = qh->head; 984 985 if (likely(skb != NULL)) { 986 qh->head = skb->next; 987 qh->qlen--; 988 if (qh->head == NULL) 989 qh->tail = NULL; 990 skb->next = NULL; 991 } 992 993 return skb; 994 } 995 996 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 997 { 998 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 999 1000 if (likely(skb != NULL)) { 1001 qdisc_qstats_backlog_dec(sch, skb); 1002 qdisc_bstats_update(sch, skb); 1003 } 1004 1005 return skb; 1006 } 1007 1008 /* Instead of calling kfree_skb() while root qdisc lock is held, 1009 * queue the skb for future freeing at end of __dev_xmit_skb() 1010 */ 1011 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 1012 { 1013 skb->next = *to_free; 1014 *to_free = skb; 1015 } 1016 1017 static inline void __qdisc_drop_all(struct sk_buff *skb, 1018 struct sk_buff **to_free) 1019 { 1020 if (skb->prev) 1021 skb->prev->next = *to_free; 1022 else 1023 skb->next = *to_free; 1024 *to_free = skb; 1025 } 1026 1027 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1028 struct qdisc_skb_head *qh, 1029 struct sk_buff **to_free) 1030 { 1031 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1032 1033 if (likely(skb != NULL)) { 1034 unsigned int len = qdisc_pkt_len(skb); 1035 1036 qdisc_qstats_backlog_dec(sch, skb); 1037 __qdisc_drop(skb, to_free); 1038 return len; 1039 } 1040 1041 return 0; 1042 } 1043 1044 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, 1045 struct sk_buff **to_free) 1046 { 1047 return __qdisc_queue_drop_head(sch, &sch->q, to_free); 1048 } 1049 1050 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1051 { 1052 const struct qdisc_skb_head *qh = &sch->q; 1053 1054 return qh->head; 1055 } 1056 1057 /* generic pseudo peek method for non-work-conserving qdisc */ 1058 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1059 { 1060 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1061 1062 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1063 if (!skb) { 1064 skb = sch->dequeue(sch); 1065 1066 if (skb) { 1067 __skb_queue_head(&sch->gso_skb, skb); 1068 /* it's still part of the queue */ 1069 qdisc_qstats_backlog_inc(sch, skb); 1070 sch->q.qlen++; 1071 } 1072 } 1073 1074 return skb; 1075 } 1076 1077 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, 1078 struct sk_buff *skb) 1079 { 1080 if (qdisc_is_percpu_stats(sch)) { 1081 qdisc_qstats_cpu_backlog_dec(sch, skb); 1082 qdisc_bstats_cpu_update(sch, skb); 1083 qdisc_qstats_cpu_qlen_dec(sch); 1084 } else { 1085 qdisc_qstats_backlog_dec(sch, skb); 1086 qdisc_bstats_update(sch, skb); 1087 sch->q.qlen--; 1088 } 1089 } 1090 1091 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, 1092 unsigned int pkt_len) 1093 { 1094 if (qdisc_is_percpu_stats(sch)) { 1095 qdisc_qstats_cpu_qlen_inc(sch); 1096 this_cpu_add(sch->cpu_qstats->backlog, pkt_len); 1097 } else { 1098 sch->qstats.backlog += pkt_len; 1099 sch->q.qlen++; 1100 } 1101 } 1102 1103 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1104 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1105 { 1106 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1107 1108 if (skb) { 1109 skb = __skb_dequeue(&sch->gso_skb); 1110 if (qdisc_is_percpu_stats(sch)) { 1111 qdisc_qstats_cpu_backlog_dec(sch, skb); 1112 qdisc_qstats_cpu_qlen_dec(sch); 1113 } else { 1114 qdisc_qstats_backlog_dec(sch, skb); 1115 sch->q.qlen--; 1116 } 1117 } else { 1118 skb = sch->dequeue(sch); 1119 } 1120 1121 return skb; 1122 } 1123 1124 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1125 { 1126 /* 1127 * We do not know the backlog in bytes of this list, it 1128 * is up to the caller to correct it 1129 */ 1130 ASSERT_RTNL(); 1131 if (qh->qlen) { 1132 rtnl_kfree_skbs(qh->head, qh->tail); 1133 1134 qh->head = NULL; 1135 qh->tail = NULL; 1136 qh->qlen = 0; 1137 } 1138 } 1139 1140 static inline void qdisc_reset_queue(struct Qdisc *sch) 1141 { 1142 __qdisc_reset_queue(&sch->q); 1143 sch->qstats.backlog = 0; 1144 } 1145 1146 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1147 struct Qdisc **pold) 1148 { 1149 struct Qdisc *old; 1150 1151 sch_tree_lock(sch); 1152 old = *pold; 1153 *pold = new; 1154 if (old != NULL) 1155 qdisc_tree_flush_backlog(old); 1156 sch_tree_unlock(sch); 1157 1158 return old; 1159 } 1160 1161 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1162 { 1163 rtnl_kfree_skbs(skb, skb); 1164 qdisc_qstats_drop(sch); 1165 } 1166 1167 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1168 struct sk_buff **to_free) 1169 { 1170 __qdisc_drop(skb, to_free); 1171 qdisc_qstats_cpu_drop(sch); 1172 1173 return NET_XMIT_DROP; 1174 } 1175 1176 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1177 struct sk_buff **to_free) 1178 { 1179 __qdisc_drop(skb, to_free); 1180 qdisc_qstats_drop(sch); 1181 1182 return NET_XMIT_DROP; 1183 } 1184 1185 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1186 struct sk_buff **to_free) 1187 { 1188 __qdisc_drop_all(skb, to_free); 1189 qdisc_qstats_drop(sch); 1190 1191 return NET_XMIT_DROP; 1192 } 1193 1194 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how 1195 long it will take to send a packet given its size. 1196 */ 1197 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) 1198 { 1199 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; 1200 if (slot < 0) 1201 slot = 0; 1202 slot >>= rtab->rate.cell_log; 1203 if (slot > 255) 1204 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; 1205 return rtab->data[slot]; 1206 } 1207 1208 struct psched_ratecfg { 1209 u64 rate_bytes_ps; /* bytes per second */ 1210 u32 mult; 1211 u16 overhead; 1212 u8 linklayer; 1213 u8 shift; 1214 }; 1215 1216 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1217 unsigned int len) 1218 { 1219 len += r->overhead; 1220 1221 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1222 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1223 1224 return ((u64)len * r->mult) >> r->shift; 1225 } 1226 1227 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1228 const struct tc_ratespec *conf, 1229 u64 rate64); 1230 1231 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1232 const struct psched_ratecfg *r) 1233 { 1234 memset(res, 0, sizeof(*res)); 1235 1236 /* legacy struct tc_ratespec has a 32bit @rate field 1237 * Qdisc using 64bit rate should add new attributes 1238 * in order to maintain compatibility. 1239 */ 1240 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1241 1242 res->overhead = r->overhead; 1243 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 1244 } 1245 1246 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 1247 * The fast path only needs to access filter list and to update stats 1248 */ 1249 struct mini_Qdisc { 1250 struct tcf_proto *filter_list; 1251 struct tcf_block *block; 1252 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 1253 struct gnet_stats_queue __percpu *cpu_qstats; 1254 struct rcu_head rcu; 1255 }; 1256 1257 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1258 const struct sk_buff *skb) 1259 { 1260 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb); 1261 } 1262 1263 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 1264 { 1265 this_cpu_inc(miniq->cpu_qstats->drops); 1266 } 1267 1268 struct mini_Qdisc_pair { 1269 struct mini_Qdisc miniq1; 1270 struct mini_Qdisc miniq2; 1271 struct mini_Qdisc __rcu **p_miniq; 1272 }; 1273 1274 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1275 struct tcf_proto *tp_head); 1276 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1277 struct mini_Qdisc __rcu **p_miniq); 1278 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, 1279 struct tcf_block *block); 1280 1281 static inline int skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res) 1282 { 1283 return res->ingress ? netif_receive_skb(skb) : dev_queue_xmit(skb); 1284 } 1285 1286 #endif 1287