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 #include <linux/xarray.h> 23 #include <net/dropreason-qdisc.h> 24 25 struct Qdisc_ops; 26 struct qdisc_walker; 27 struct tcf_walker; 28 struct module; 29 struct bpf_flow_keys; 30 struct Qdisc; 31 struct netdev_queue; 32 33 struct qdisc_rate_table { 34 struct tc_ratespec rate; 35 u32 data[256]; 36 struct qdisc_rate_table *next; 37 int refcnt; 38 }; 39 40 enum qdisc_state_t { 41 __QDISC_STATE_SCHED, 42 __QDISC_STATE_DEACTIVATED, 43 __QDISC_STATE_MISSED, 44 __QDISC_STATE_DRAINING, 45 }; 46 47 #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED) 48 #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING) 49 50 #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \ 51 QDISC_STATE_DRAINING) 52 53 struct qdisc_size_table { 54 struct rcu_head rcu; 55 struct list_head list; 56 struct tc_sizespec szopts; 57 int refcnt; 58 u16 data[]; 59 }; 60 61 /* similar to sk_buff_head, but skb->prev pointer is undefined. */ 62 struct qdisc_skb_head { 63 struct sk_buff *head; 64 struct sk_buff *tail; 65 __u32 qlen; 66 spinlock_t lock; 67 }; 68 69 struct Qdisc { 70 int (*enqueue)(struct sk_buff *skb, 71 struct Qdisc *sch, 72 struct sk_buff **to_free); 73 struct sk_buff * (*dequeue)(struct Qdisc *sch); 74 unsigned int flags; 75 #define TCQ_F_BUILTIN 1 76 #define TCQ_F_INGRESS 2 77 #define TCQ_F_CAN_BYPASS 4 78 #define TCQ_F_MQROOT 8 79 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for 80 * q->dev_queue : It can test 81 * netif_xmit_frozen_or_stopped() before 82 * dequeueing next packet. 83 * Its true for MQ/MQPRIO slaves, or non 84 * multiqueue device. 85 */ 86 #define TCQ_F_WARN_NONWC (1 << 16) 87 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ 88 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : 89 * qdisc_tree_reduce_backlog() should stop. 90 */ 91 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ 92 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ 93 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ 94 #define TCQ_F_DEQUEUE_DROPS 0x400 /* ->dequeue() can drop packets in q->to_free */ 95 96 u32 limit; 97 const struct Qdisc_ops *ops; 98 struct qdisc_size_table __rcu *stab; 99 struct hlist_node hash; 100 u32 handle; 101 u32 parent; 102 103 struct netdev_queue *dev_queue; 104 105 struct net_rate_estimator __rcu *rate_est; 106 struct gnet_stats_basic_sync __percpu *cpu_bstats; 107 struct gnet_stats_queue __percpu *cpu_qstats; 108 int pad; 109 refcount_t refcnt; 110 111 /* Cache line potentially dirtied in dequeue() or __netif_reschedule(). */ 112 __cacheline_group_begin(Qdisc_read_mostly) ____cacheline_aligned; 113 struct sk_buff_head gso_skb; 114 struct Qdisc *next_sched; 115 struct sk_buff_head skb_bad_txq; 116 __cacheline_group_end(Qdisc_read_mostly); 117 118 /* Fields dirtied in dequeue() fast path. */ 119 __cacheline_group_begin(Qdisc_write) ____cacheline_aligned; 120 struct qdisc_skb_head q; 121 unsigned long state; 122 struct gnet_stats_basic_sync bstats; 123 bool running; /* must be written under qdisc spinlock */ 124 125 /* Note : we only change qstats.backlog in fast path. */ 126 struct gnet_stats_queue qstats; 127 128 struct sk_buff *to_free; 129 __cacheline_group_end(Qdisc_write); 130 131 132 atomic_long_t defer_count ____cacheline_aligned_in_smp; 133 struct llist_head defer_list; 134 135 spinlock_t seqlock; 136 137 struct rcu_head rcu; 138 netdevice_tracker dev_tracker; 139 struct lock_class_key root_lock_key; 140 /* private data */ 141 long privdata[] ____cacheline_aligned; 142 }; 143 144 static inline void qdisc_refcount_inc(struct Qdisc *qdisc) 145 { 146 if (qdisc->flags & TCQ_F_BUILTIN) 147 return; 148 refcount_inc(&qdisc->refcnt); 149 } 150 151 static inline bool qdisc_refcount_dec_if_one(struct Qdisc *qdisc) 152 { 153 if (qdisc->flags & TCQ_F_BUILTIN) 154 return true; 155 return refcount_dec_if_one(&qdisc->refcnt); 156 } 157 158 /* Intended to be used by unlocked users, when concurrent qdisc release is 159 * possible. 160 */ 161 162 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) 163 { 164 if (qdisc->flags & TCQ_F_BUILTIN) 165 return qdisc; 166 if (refcount_inc_not_zero(&qdisc->refcnt)) 167 return qdisc; 168 return NULL; 169 } 170 171 /* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc 172 * root_lock section, or provide their own memory barriers -- ordering 173 * against qdisc_run_begin/end() atomic bit operations. 174 */ 175 static inline bool qdisc_is_running(struct Qdisc *qdisc) 176 { 177 if (qdisc->flags & TCQ_F_NOLOCK) 178 return spin_is_locked(&qdisc->seqlock); 179 return READ_ONCE(qdisc->running); 180 } 181 182 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc) 183 { 184 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY); 185 } 186 187 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) 188 { 189 return q->flags & TCQ_F_CPUSTATS; 190 } 191 192 static inline bool qdisc_is_empty(const struct Qdisc *qdisc) 193 { 194 if (qdisc_is_percpu_stats(qdisc)) 195 return nolock_qdisc_is_empty(qdisc); 196 return !READ_ONCE(qdisc->q.qlen); 197 } 198 199 /* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with 200 * the qdisc root lock acquired. 201 */ 202 static inline bool qdisc_run_begin(struct Qdisc *qdisc) 203 { 204 if (qdisc->flags & TCQ_F_NOLOCK) { 205 if (spin_trylock(&qdisc->seqlock)) 206 return true; 207 208 /* No need to insist if the MISSED flag was already set. 209 * Note that test_and_set_bit() also gives us memory ordering 210 * guarantees wrt potential earlier enqueue() and below 211 * spin_trylock(), both of which are necessary to prevent races 212 */ 213 if (test_and_set_bit(__QDISC_STATE_MISSED, &qdisc->state)) 214 return false; 215 216 /* Try to take the lock again to make sure that we will either 217 * grab it or the CPU that still has it will see MISSED set 218 * when testing it in qdisc_run_end() 219 */ 220 return spin_trylock(&qdisc->seqlock); 221 } 222 if (READ_ONCE(qdisc->running)) 223 return false; 224 WRITE_ONCE(qdisc->running, true); 225 return true; 226 } 227 228 static inline struct sk_buff *qdisc_run_end(struct Qdisc *qdisc) 229 { 230 struct sk_buff *to_free = NULL; 231 232 if (qdisc->flags & TCQ_F_NOLOCK) { 233 spin_unlock(&qdisc->seqlock); 234 235 /* spin_unlock() only has store-release semantic. The unlock 236 * and test_bit() ordering is a store-load ordering, so a full 237 * memory barrier is needed here. 238 */ 239 smp_mb(); 240 241 if (unlikely(test_bit(__QDISC_STATE_MISSED, 242 &qdisc->state))) 243 __netif_schedule(qdisc); 244 return NULL; 245 } 246 247 if (qdisc->flags & TCQ_F_DEQUEUE_DROPS) { 248 to_free = qdisc->to_free; 249 if (to_free) 250 qdisc->to_free = NULL; 251 } 252 WRITE_ONCE(qdisc->running, false); 253 return to_free; 254 } 255 256 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) 257 { 258 return qdisc->flags & TCQ_F_ONETXQUEUE; 259 } 260 261 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) 262 { 263 return netdev_queue_dql_avail(txq); 264 } 265 266 struct Qdisc_class_ops { 267 unsigned int flags; 268 /* Child qdisc manipulation */ 269 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); 270 int (*graft)(struct Qdisc *, unsigned long cl, 271 struct Qdisc *, struct Qdisc **, 272 struct netlink_ext_ack *extack); 273 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); 274 void (*qlen_notify)(struct Qdisc *, unsigned long); 275 276 /* Class manipulation routines */ 277 unsigned long (*find)(struct Qdisc *, u32 classid); 278 int (*change)(struct Qdisc *, u32, u32, 279 struct nlattr **, unsigned long *, 280 struct netlink_ext_ack *); 281 int (*delete)(struct Qdisc *, unsigned long, 282 struct netlink_ext_ack *); 283 void (*walk)(struct Qdisc *, struct qdisc_walker * arg); 284 285 /* Filter manipulation */ 286 struct tcf_block * (*tcf_block)(struct Qdisc *sch, 287 unsigned long arg, 288 struct netlink_ext_ack *extack); 289 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, 290 u32 classid); 291 void (*unbind_tcf)(struct Qdisc *, unsigned long); 292 293 /* rtnetlink specific */ 294 int (*dump)(struct Qdisc *, unsigned long, 295 struct sk_buff *skb, struct tcmsg*); 296 int (*dump_stats)(struct Qdisc *, unsigned long, 297 struct gnet_dump *); 298 }; 299 300 /* Qdisc_class_ops flag values */ 301 302 /* Implements API that doesn't require rtnl lock */ 303 enum qdisc_class_ops_flags { 304 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, 305 }; 306 307 struct Qdisc_ops { 308 struct Qdisc_ops *next; 309 const struct Qdisc_class_ops *cl_ops; 310 char id[IFNAMSIZ]; 311 int priv_size; 312 unsigned int static_flags; 313 314 int (*enqueue)(struct sk_buff *skb, 315 struct Qdisc *sch, 316 struct sk_buff **to_free); 317 struct sk_buff * (*dequeue)(struct Qdisc *); 318 struct sk_buff * (*peek)(struct Qdisc *); 319 320 int (*init)(struct Qdisc *sch, struct nlattr *arg, 321 struct netlink_ext_ack *extack); 322 void (*reset)(struct Qdisc *); 323 void (*destroy)(struct Qdisc *); 324 int (*change)(struct Qdisc *sch, 325 struct nlattr *arg, 326 struct netlink_ext_ack *extack); 327 void (*attach)(struct Qdisc *sch); 328 int (*change_tx_queue_len)(struct Qdisc *, unsigned int); 329 void (*change_real_num_tx)(struct Qdisc *sch, 330 unsigned int new_real_tx); 331 332 int (*dump)(struct Qdisc *, struct sk_buff *); 333 int (*dump_stats)(struct Qdisc *, struct gnet_dump *); 334 335 void (*ingress_block_set)(struct Qdisc *sch, 336 u32 block_index); 337 void (*egress_block_set)(struct Qdisc *sch, 338 u32 block_index); 339 u32 (*ingress_block_get)(struct Qdisc *sch); 340 u32 (*egress_block_get)(struct Qdisc *sch); 341 342 struct module *owner; 343 }; 344 345 struct tcf_result { 346 union { 347 struct { 348 unsigned long class; 349 u32 classid; 350 }; 351 const struct tcf_proto *goto_tp; 352 }; 353 }; 354 355 struct tcf_chain; 356 357 struct tcf_proto_ops { 358 struct list_head head; 359 char kind[IFNAMSIZ]; 360 361 int (*classify)(struct sk_buff *, 362 const struct tcf_proto *, 363 struct tcf_result *); 364 int (*init)(struct tcf_proto*); 365 void (*destroy)(struct tcf_proto *tp, bool rtnl_held, 366 struct netlink_ext_ack *extack); 367 368 void* (*get)(struct tcf_proto*, u32 handle); 369 void (*put)(struct tcf_proto *tp, void *f); 370 int (*change)(struct net *net, struct sk_buff *, 371 struct tcf_proto*, unsigned long, 372 u32 handle, struct nlattr **, 373 void **, u32, 374 struct netlink_ext_ack *); 375 int (*delete)(struct tcf_proto *tp, void *arg, 376 bool *last, bool rtnl_held, 377 struct netlink_ext_ack *); 378 bool (*delete_empty)(struct tcf_proto *tp); 379 void (*walk)(struct tcf_proto *tp, 380 struct tcf_walker *arg, bool rtnl_held); 381 int (*reoffload)(struct tcf_proto *tp, bool add, 382 flow_setup_cb_t *cb, void *cb_priv, 383 struct netlink_ext_ack *extack); 384 void (*hw_add)(struct tcf_proto *tp, 385 void *type_data); 386 void (*hw_del)(struct tcf_proto *tp, 387 void *type_data); 388 void (*bind_class)(void *, u32, unsigned long, 389 void *, unsigned long); 390 void * (*tmplt_create)(struct net *net, 391 struct tcf_chain *chain, 392 struct nlattr **tca, 393 struct netlink_ext_ack *extack); 394 void (*tmplt_destroy)(void *tmplt_priv); 395 void (*tmplt_reoffload)(struct tcf_chain *chain, 396 bool add, 397 flow_setup_cb_t *cb, 398 void *cb_priv); 399 struct tcf_exts * (*get_exts)(const struct tcf_proto *tp, 400 u32 handle); 401 402 /* rtnetlink specific */ 403 int (*dump)(struct net*, struct tcf_proto*, void *, 404 struct sk_buff *skb, struct tcmsg*, 405 bool); 406 int (*terse_dump)(struct net *net, 407 struct tcf_proto *tp, void *fh, 408 struct sk_buff *skb, 409 struct tcmsg *t, bool rtnl_held); 410 int (*tmplt_dump)(struct sk_buff *skb, 411 struct net *net, 412 void *tmplt_priv); 413 414 struct module *owner; 415 int flags; 416 }; 417 418 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags 419 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race 420 * conditions can occur when filters are inserted/deleted simultaneously. 421 */ 422 enum tcf_proto_ops_flags { 423 TCF_PROTO_OPS_DOIT_UNLOCKED = 1, 424 }; 425 426 struct tcf_proto { 427 /* Fast access part */ 428 struct tcf_proto __rcu *next; 429 void __rcu *root; 430 431 /* called under RCU BH lock*/ 432 int (*classify)(struct sk_buff *, 433 const struct tcf_proto *, 434 struct tcf_result *); 435 __be16 protocol; 436 437 /* All the rest */ 438 u32 prio; 439 void *data; 440 const struct tcf_proto_ops *ops; 441 struct tcf_chain *chain; 442 /* Lock protects tcf_proto shared state and can be used by unlocked 443 * classifiers to protect their private data. 444 */ 445 spinlock_t lock; 446 bool deleting; 447 bool counted; 448 bool usesw; 449 refcount_t refcnt; 450 struct rcu_head rcu; 451 struct hlist_node destroy_ht_node; 452 }; 453 454 struct qdisc_skb_cb { 455 unsigned int pkt_len; 456 u16 pkt_segs; 457 u16 tc_classid; 458 #define QDISC_CB_PRIV_LEN 20 459 unsigned char data[QDISC_CB_PRIV_LEN]; 460 461 u16 slave_dev_queue_mapping; 462 u8 post_ct:1; 463 u8 post_ct_snat:1; 464 u8 post_ct_dnat:1; 465 }; 466 467 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); 468 469 struct tcf_chain { 470 /* Protects filter_chain. */ 471 struct mutex filter_chain_lock; 472 struct tcf_proto __rcu *filter_chain; 473 struct list_head list; 474 struct tcf_block *block; 475 u32 index; /* chain index */ 476 unsigned int refcnt; 477 unsigned int action_refcnt; 478 bool explicitly_created; 479 bool flushing; 480 const struct tcf_proto_ops *tmplt_ops; 481 void *tmplt_priv; 482 struct rcu_head rcu; 483 }; 484 485 struct tcf_block { 486 struct xarray ports; /* datapath accessible */ 487 /* Lock protects tcf_block and lifetime-management data of chains 488 * attached to the block (refcnt, action_refcnt, explicitly_created). 489 */ 490 struct mutex lock; 491 struct list_head chain_list; 492 u32 index; /* block index for shared blocks */ 493 u32 classid; /* which class this block belongs to */ 494 refcount_t refcnt; 495 struct net *net; 496 struct Qdisc *q; 497 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */ 498 struct flow_block flow_block; 499 struct list_head owner_list; 500 bool keep_dst; 501 atomic_t useswcnt; 502 atomic_t offloadcnt; /* Number of oddloaded filters */ 503 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ 504 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ 505 struct { 506 struct tcf_chain *chain; 507 struct list_head filter_chain_list; 508 } chain0; 509 struct rcu_head rcu; 510 DECLARE_HASHTABLE(proto_destroy_ht, 7); 511 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ 512 }; 513 514 struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index); 515 516 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) 517 { 518 return lockdep_is_held(&chain->filter_chain_lock); 519 } 520 521 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) 522 { 523 return lockdep_is_held(&tp->lock); 524 } 525 526 #define tcf_chain_dereference(p, chain) \ 527 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) 528 529 #define tcf_proto_dereference(p, tp) \ 530 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) 531 532 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 533 { 534 struct qdisc_skb_cb *qcb; 535 536 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb)); 537 BUILD_BUG_ON(sizeof(qcb->data) < sz); 538 } 539 540 static inline int qdisc_qlen(const struct Qdisc *q) 541 { 542 return q->q.qlen; 543 } 544 545 static inline int qdisc_qlen_lockless(const struct Qdisc *q) 546 { 547 return READ_ONCE(q->q.qlen); 548 } 549 550 static inline void qdisc_qlen_inc(struct Qdisc *q) 551 { 552 WRITE_ONCE(q->q.qlen, q->q.qlen + 1); 553 } 554 555 static inline void qdisc_qlen_dec(struct Qdisc *q) 556 { 557 WRITE_ONCE(q->q.qlen, q->q.qlen - 1); 558 } 559 560 static inline int qdisc_qlen_sum(const struct Qdisc *q) 561 { 562 __u32 qlen = q->qstats.qlen; 563 int i; 564 565 if (qdisc_is_percpu_stats(q)) { 566 for_each_possible_cpu(i) 567 qlen += READ_ONCE(per_cpu_ptr(q->cpu_qstats, i)->qlen); 568 } else { 569 qlen += qdisc_qlen_lockless(q); 570 } 571 572 return qlen; 573 } 574 575 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 576 { 577 return (struct qdisc_skb_cb *)skb->cb; 578 } 579 580 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 581 { 582 return &qdisc->q.lock; 583 } 584 585 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 586 { 587 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 588 589 return q; 590 } 591 592 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) 593 { 594 return rcu_dereference_bh(qdisc->dev_queue->qdisc); 595 } 596 597 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 598 { 599 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping); 600 } 601 602 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 603 { 604 struct Qdisc *root = qdisc_root_sleeping(qdisc); 605 606 ASSERT_RTNL(); 607 return qdisc_lock(root); 608 } 609 610 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 611 { 612 return qdisc->dev_queue->dev; 613 } 614 615 static inline void sch_tree_lock(struct Qdisc *q) 616 { 617 if (q->flags & TCQ_F_MQROOT) 618 spin_lock_bh(qdisc_lock(q)); 619 else 620 spin_lock_bh(qdisc_root_sleeping_lock(q)); 621 } 622 623 static inline void sch_tree_unlock(struct Qdisc *q) 624 { 625 if (q->flags & TCQ_F_MQROOT) 626 spin_unlock_bh(qdisc_lock(q)); 627 else 628 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 629 } 630 631 extern struct Qdisc noop_qdisc; 632 extern struct Qdisc_ops noop_qdisc_ops; 633 extern struct Qdisc_ops pfifo_fast_ops; 634 extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1]; 635 extern struct Qdisc_ops mq_qdisc_ops; 636 extern struct Qdisc_ops noqueue_qdisc_ops; 637 extern const struct Qdisc_ops *default_qdisc_ops; 638 static inline const struct Qdisc_ops * 639 get_default_qdisc_ops(const struct net_device *dev, int ntx) 640 { 641 return ntx < dev->real_num_tx_queues ? 642 default_qdisc_ops : &pfifo_fast_ops; 643 } 644 645 struct Qdisc_class_common { 646 u32 classid; 647 unsigned int filter_cnt; 648 struct hlist_node hnode; 649 }; 650 651 struct Qdisc_class_hash { 652 struct hlist_head *hash; 653 unsigned int hashsize; 654 unsigned int hashmask; 655 unsigned int hashelems; 656 }; 657 658 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 659 { 660 id ^= id >> 8; 661 id ^= id >> 4; 662 return id & mask; 663 } 664 665 static inline struct Qdisc_class_common * 666 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 667 { 668 struct Qdisc_class_common *cl; 669 unsigned int h; 670 671 if (!id) 672 return NULL; 673 674 h = qdisc_class_hash(id, hash->hashmask); 675 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 676 if (cl->classid == id) 677 return cl; 678 } 679 return NULL; 680 } 681 682 static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl) 683 { 684 return cl->filter_cnt > 0; 685 } 686 687 static inline void qdisc_class_get(struct Qdisc_class_common *cl) 688 { 689 unsigned int res; 690 691 if (check_add_overflow(cl->filter_cnt, 1, &res)) 692 WARN(1, "Qdisc class overflow"); 693 694 cl->filter_cnt = res; 695 } 696 697 static inline void qdisc_class_put(struct Qdisc_class_common *cl) 698 { 699 unsigned int res; 700 701 if (check_sub_overflow(cl->filter_cnt, 1, &res)) 702 WARN(1, "Qdisc class underflow"); 703 704 cl->filter_cnt = res; 705 } 706 707 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 708 { 709 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 710 711 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 712 } 713 714 int qdisc_class_hash_init(struct Qdisc_class_hash *); 715 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 716 struct Qdisc_class_common *); 717 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 718 struct Qdisc_class_common *); 719 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 720 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 721 722 int dev_qdisc_change_tx_queue_len(struct net_device *dev); 723 void dev_qdisc_change_real_num_tx(struct net_device *dev, 724 unsigned int new_real_tx); 725 void dev_init_scheduler(struct net_device *dev); 726 void dev_shutdown(struct net_device *dev); 727 void dev_activate(struct net_device *dev); 728 void dev_deactivate(struct net_device *dev, bool reset_needed); 729 void dev_deactivate_many(struct list_head *head, bool reset_needed); 730 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 731 struct Qdisc *qdisc); 732 void qdisc_reset(struct Qdisc *qdisc); 733 void qdisc_destroy(struct Qdisc *qdisc); 734 void qdisc_put(struct Qdisc *qdisc); 735 void qdisc_put_unlocked(struct Qdisc *qdisc); 736 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); 737 738 static inline void dev_reset_queue(struct net_device *dev, 739 struct netdev_queue *dev_queue, 740 void *_unused) 741 { 742 struct Qdisc *qdisc; 743 bool nolock; 744 745 qdisc = rtnl_dereference(dev_queue->qdisc_sleeping); 746 if (!qdisc) 747 return; 748 749 nolock = qdisc->flags & TCQ_F_NOLOCK; 750 751 if (nolock) 752 spin_lock_bh(&qdisc->seqlock); 753 spin_lock_bh(qdisc_lock(qdisc)); 754 755 qdisc_reset(qdisc); 756 757 spin_unlock_bh(qdisc_lock(qdisc)); 758 if (nolock) { 759 clear_bit(__QDISC_STATE_MISSED, &qdisc->state); 760 clear_bit(__QDISC_STATE_DRAINING, &qdisc->state); 761 spin_unlock_bh(&qdisc->seqlock); 762 } 763 } 764 765 #ifdef CONFIG_NET_SCHED 766 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 767 void *type_data); 768 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 769 struct Qdisc *new, struct Qdisc *old, 770 enum tc_setup_type type, void *type_data, 771 struct netlink_ext_ack *extack); 772 #else 773 static inline int 774 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 775 void *type_data) 776 { 777 q->flags &= ~TCQ_F_OFFLOADED; 778 return 0; 779 } 780 781 static inline void 782 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 783 struct Qdisc *new, struct Qdisc *old, 784 enum tc_setup_type type, void *type_data, 785 struct netlink_ext_ack *extack) 786 { 787 } 788 #endif 789 void qdisc_offload_query_caps(struct net_device *dev, 790 enum tc_setup_type type, 791 void *caps, size_t caps_len); 792 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 793 const struct Qdisc_ops *ops, 794 struct netlink_ext_ack *extack); 795 void qdisc_free(struct Qdisc *qdisc); 796 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 797 const struct Qdisc_ops *ops, u32 parentid, 798 struct netlink_ext_ack *extack); 799 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 800 const struct qdisc_size_table *stab); 801 int skb_do_redirect(struct sk_buff *); 802 803 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 804 { 805 #ifdef CONFIG_NET_XGRESS 806 return skb->tc_at_ingress; 807 #else 808 return false; 809 #endif 810 } 811 812 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 813 { 814 #ifdef CONFIG_NET_CLS_ACT 815 if (skb->tc_skip_classify) { 816 skb->tc_skip_classify = 0; 817 return true; 818 } 819 #endif 820 return false; 821 } 822 823 /* Reset all TX qdiscs greater than index of a device. */ 824 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 825 { 826 struct Qdisc *qdisc; 827 bool nolock; 828 829 for (; i < dev->num_tx_queues; i++) { 830 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 831 if (qdisc) { 832 nolock = qdisc->flags & TCQ_F_NOLOCK; 833 834 if (nolock) 835 spin_lock_bh(&qdisc->seqlock); 836 spin_lock_bh(qdisc_lock(qdisc)); 837 qdisc_reset(qdisc); 838 spin_unlock_bh(qdisc_lock(qdisc)); 839 if (nolock) { 840 clear_bit(__QDISC_STATE_MISSED, &qdisc->state); 841 clear_bit(__QDISC_STATE_DRAINING, &qdisc->state); 842 spin_unlock_bh(&qdisc->seqlock); 843 } 844 } 845 } 846 } 847 848 /* Are all TX queues of the device empty? */ 849 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 850 { 851 unsigned int i; 852 853 rcu_read_lock(); 854 for (i = 0; i < dev->num_tx_queues; i++) { 855 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 856 const struct Qdisc *q = rcu_dereference(txq->qdisc); 857 858 if (!qdisc_is_empty(q)) { 859 rcu_read_unlock(); 860 return false; 861 } 862 } 863 rcu_read_unlock(); 864 return true; 865 } 866 867 /* Are any of the TX qdiscs changing? */ 868 static inline bool qdisc_tx_changing(const struct net_device *dev) 869 { 870 unsigned int i; 871 872 for (i = 0; i < dev->num_tx_queues; i++) { 873 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 874 875 if (rcu_access_pointer(txq->qdisc) != 876 rcu_access_pointer(txq->qdisc_sleeping)) 877 return true; 878 } 879 return false; 880 } 881 882 /* "noqueue" qdisc identified by not having any enqueue, see noqueue_init() */ 883 static inline bool qdisc_txq_has_no_queue(const struct netdev_queue *txq) 884 { 885 struct Qdisc *qdisc = rcu_access_pointer(txq->qdisc); 886 887 return qdisc->enqueue == NULL; 888 } 889 890 /* Is the device using the noop qdisc on all queues? */ 891 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 892 { 893 unsigned int i; 894 895 for (i = 0; i < dev->num_tx_queues; i++) { 896 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 897 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 898 return false; 899 } 900 return true; 901 } 902 903 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 904 { 905 return qdisc_skb_cb(skb)->pkt_len; 906 } 907 908 static inline unsigned int qdisc_pkt_segs(const struct sk_buff *skb) 909 { 910 u32 pkt_segs = qdisc_skb_cb(skb)->pkt_segs; 911 912 DEBUG_NET_WARN_ON_ONCE(pkt_segs != 913 (skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1)); 914 return pkt_segs; 915 } 916 917 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 918 enum net_xmit_qdisc_t { 919 __NET_XMIT_STOLEN = 0x00010000, 920 __NET_XMIT_BYPASS = 0x00020000, 921 }; 922 923 #ifdef CONFIG_NET_CLS_ACT 924 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 925 #else 926 #define net_xmit_drop_count(e) (1) 927 #endif 928 929 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 930 const struct Qdisc *sch) 931 { 932 #ifdef CONFIG_NET_SCHED 933 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 934 935 if (stab) 936 __qdisc_calculate_pkt_len(skb, stab); 937 #endif 938 } 939 940 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 941 struct sk_buff **to_free) 942 { 943 return sch->enqueue(skb, sch, to_free); 944 } 945 946 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats, 947 __u64 bytes, __u64 packets) 948 { 949 u64_stats_update_begin(&bstats->syncp); 950 u64_stats_add(&bstats->bytes, bytes); 951 u64_stats_add(&bstats->packets, packets); 952 u64_stats_update_end(&bstats->syncp); 953 } 954 955 static inline void _bstats_set(struct gnet_stats_basic_sync *bstats, 956 u64 bytes, u64 packets) 957 { 958 u64_stats_update_begin(&bstats->syncp); 959 u64_stats_set(&bstats->bytes, bytes); 960 u64_stats_set(&bstats->packets, packets); 961 u64_stats_update_end(&bstats->syncp); 962 } 963 964 static inline void bstats_update(struct gnet_stats_basic_sync *bstats, 965 const struct sk_buff *skb) 966 { 967 _bstats_update(bstats, qdisc_pkt_len(skb), qdisc_pkt_segs(skb)); 968 } 969 970 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 971 const struct sk_buff *skb) 972 { 973 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb); 974 } 975 976 static inline void qdisc_bstats_update(struct Qdisc *sch, 977 const struct sk_buff *skb) 978 { 979 bstats_update(&sch->bstats, skb); 980 } 981 982 static inline void qstats_backlog_sub(struct Qdisc *sch, u32 val) 983 { 984 WRITE_ONCE(sch->qstats.backlog, sch->qstats.backlog - val); 985 } 986 987 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 988 const struct sk_buff *skb) 989 { 990 qstats_backlog_sub(sch, qdisc_pkt_len(skb)); 991 } 992 993 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 994 const struct sk_buff *skb) 995 { 996 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 997 } 998 999 static inline void qstats_backlog_add(struct Qdisc *sch, u32 val) 1000 { 1001 WRITE_ONCE(sch->qstats.backlog, sch->qstats.backlog + val); 1002 } 1003 1004 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 1005 const struct sk_buff *skb) 1006 { 1007 qstats_backlog_add(sch, qdisc_pkt_len(skb)); 1008 } 1009 1010 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 1011 const struct sk_buff *skb) 1012 { 1013 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 1014 } 1015 1016 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 1017 { 1018 this_cpu_inc(sch->cpu_qstats->qlen); 1019 } 1020 1021 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 1022 { 1023 this_cpu_dec(sch->cpu_qstats->qlen); 1024 } 1025 1026 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 1027 { 1028 this_cpu_inc(sch->cpu_qstats->requeues); 1029 } 1030 1031 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 1032 { 1033 WRITE_ONCE(sch->qstats.drops, sch->qstats.drops + count); 1034 } 1035 1036 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 1037 { 1038 WRITE_ONCE(qstats->drops, qstats->drops + 1); 1039 } 1040 1041 static inline void qstats_cpu_drop_inc(struct gnet_stats_queue __percpu *qstats) 1042 { 1043 this_cpu_inc(qstats->drops); 1044 } 1045 1046 static inline void qstats_cpu_overlimit_inc(struct gnet_stats_queue __percpu *qstats) 1047 { 1048 this_cpu_inc(qstats->overlimits); 1049 } 1050 1051 static inline void qdisc_qstats_drop(struct Qdisc *sch) 1052 { 1053 qstats_drop_inc(&sch->qstats); 1054 } 1055 1056 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 1057 { 1058 this_cpu_inc(sch->cpu_qstats->drops); 1059 } 1060 1061 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 1062 { 1063 WRITE_ONCE(sch->qstats.overlimits, sch->qstats.overlimits + 1); 1064 } 1065 1066 static inline int qdisc_qstats_copy(struct gnet_dump *d, const struct Qdisc *sch) 1067 { 1068 __u32 qlen = qdisc_qlen_sum(sch); 1069 1070 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); 1071 } 1072 1073 static inline void qdisc_qstats_qlen_backlog(const struct Qdisc *sch, 1074 u32 *qlen, u32 *backlog) 1075 { 1076 struct gnet_stats_queue qstats = { 0 }; 1077 1078 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats); 1079 *qlen = qstats.qlen + qdisc_qlen_lockless(sch); 1080 *backlog = qstats.backlog; 1081 } 1082 1083 static inline void qdisc_purge_queue(struct Qdisc *sch) 1084 { 1085 __u32 qlen, backlog; 1086 1087 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 1088 qdisc_reset(sch); 1089 qdisc_tree_reduce_backlog(sch, qlen, backlog); 1090 } 1091 1092 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 1093 struct qdisc_skb_head *qh) 1094 { 1095 struct sk_buff *last = qh->tail; 1096 1097 if (last) { 1098 skb->next = NULL; 1099 last->next = skb; 1100 qh->tail = skb; 1101 } else { 1102 qh->tail = skb; 1103 qh->head = skb; 1104 } 1105 WRITE_ONCE(qh->qlen, qh->qlen + 1); 1106 } 1107 1108 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 1109 { 1110 __qdisc_enqueue_tail(skb, &sch->q); 1111 qdisc_qstats_backlog_inc(sch, skb); 1112 return NET_XMIT_SUCCESS; 1113 } 1114 1115 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 1116 struct qdisc_skb_head *qh) 1117 { 1118 skb->next = qh->head; 1119 1120 if (!qh->head) 1121 qh->tail = skb; 1122 qh->head = skb; 1123 WRITE_ONCE(qh->qlen, qh->qlen + 1); 1124 } 1125 1126 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 1127 { 1128 struct sk_buff *skb = qh->head; 1129 1130 if (likely(skb != NULL)) { 1131 qh->head = skb->next; 1132 WRITE_ONCE(qh->qlen, qh->qlen - 1); 1133 if (qh->head == NULL) 1134 qh->tail = NULL; 1135 skb->next = NULL; 1136 } 1137 1138 return skb; 1139 } 1140 1141 static inline struct sk_buff *qdisc_dequeue_internal(struct Qdisc *sch, bool direct) 1142 { 1143 struct sk_buff *skb; 1144 1145 skb = __skb_dequeue(&sch->gso_skb); 1146 if (skb) { 1147 qdisc_qlen_dec(sch); 1148 qdisc_qstats_backlog_dec(sch, skb); 1149 return skb; 1150 } 1151 if (direct) { 1152 skb = __qdisc_dequeue_head(&sch->q); 1153 if (skb) 1154 qdisc_qstats_backlog_dec(sch, skb); 1155 return skb; 1156 } else { 1157 return sch->dequeue(sch); 1158 } 1159 } 1160 1161 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 1162 { 1163 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 1164 1165 if (likely(skb != NULL)) { 1166 qdisc_qstats_backlog_dec(sch, skb); 1167 qdisc_bstats_update(sch, skb); 1168 } 1169 1170 return skb; 1171 } 1172 1173 struct tc_skb_cb { 1174 struct qdisc_skb_cb qdisc_cb; 1175 u32 drop_reason; 1176 1177 u16 zone; /* Only valid if qdisc_skb_cb(skb)->post_ct = true */ 1178 u16 mru; 1179 }; 1180 1181 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) 1182 { 1183 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; 1184 1185 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); 1186 return cb; 1187 } 1188 1189 /* TC classifier accessors - use enum skb_drop_reason */ 1190 static inline enum skb_drop_reason 1191 tcf_get_drop_reason(const struct sk_buff *skb) 1192 { 1193 return (enum skb_drop_reason)tc_skb_cb(skb)->drop_reason; 1194 } 1195 1196 static inline void tcf_set_drop_reason(const struct sk_buff *skb, 1197 enum skb_drop_reason reason) 1198 { 1199 tc_skb_cb(skb)->drop_reason = (enum qdisc_drop_reason)reason; 1200 } 1201 1202 /* Qdisc accessors - use enum qdisc_drop_reason */ 1203 static inline enum qdisc_drop_reason 1204 tcf_get_qdisc_drop_reason(const struct sk_buff *skb) 1205 { 1206 return tc_skb_cb(skb)->drop_reason; 1207 } 1208 1209 static inline void tcf_set_qdisc_drop_reason(const struct sk_buff *skb, 1210 enum qdisc_drop_reason reason) 1211 { 1212 tc_skb_cb(skb)->drop_reason = reason; 1213 } 1214 1215 void __tcf_kfree_skb_list(struct sk_buff *skb, struct Qdisc *q, 1216 struct netdev_queue *txq, struct net_device *dev); 1217 1218 static inline void tcf_kfree_skb_list(struct sk_buff *skb, struct Qdisc *q, 1219 struct netdev_queue *txq, 1220 struct net_device *dev) 1221 { 1222 if (unlikely(skb)) 1223 __tcf_kfree_skb_list(skb, q, txq, dev); 1224 } 1225 1226 static inline void qdisc_dequeue_drop(struct Qdisc *q, struct sk_buff *skb, 1227 enum qdisc_drop_reason reason) 1228 { 1229 struct Qdisc *root; 1230 1231 DEBUG_NET_WARN_ON_ONCE(!(q->flags & TCQ_F_DEQUEUE_DROPS)); 1232 DEBUG_NET_WARN_ON_ONCE(q->flags & TCQ_F_NOLOCK); 1233 1234 rcu_read_lock(); 1235 root = qdisc_root_sleeping(q); 1236 1237 if (root->flags & TCQ_F_DEQUEUE_DROPS) { 1238 tcf_set_qdisc_drop_reason(skb, reason); 1239 skb->next = root->to_free; 1240 root->to_free = skb; 1241 } else { 1242 kfree_skb_reason(skb, (enum skb_drop_reason)reason); 1243 } 1244 rcu_read_unlock(); 1245 } 1246 1247 /* Instead of calling kfree_skb() while root qdisc lock is held, 1248 * queue the skb for future freeing at end of __dev_xmit_skb() 1249 */ 1250 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 1251 { 1252 skb->next = *to_free; 1253 *to_free = skb; 1254 } 1255 1256 static inline void __qdisc_drop_all(struct sk_buff *skb, 1257 struct sk_buff **to_free) 1258 { 1259 if (skb->prev) 1260 skb->prev->next = *to_free; 1261 else 1262 skb->next = *to_free; 1263 *to_free = skb; 1264 } 1265 1266 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1267 struct qdisc_skb_head *qh, 1268 struct sk_buff **to_free) 1269 { 1270 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1271 1272 if (likely(skb != NULL)) { 1273 unsigned int len = qdisc_pkt_len(skb); 1274 1275 qdisc_qstats_backlog_dec(sch, skb); 1276 __qdisc_drop(skb, to_free); 1277 return len; 1278 } 1279 1280 return 0; 1281 } 1282 1283 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1284 { 1285 const struct qdisc_skb_head *qh = &sch->q; 1286 1287 return qh->head; 1288 } 1289 1290 /* generic pseudo peek method for non-work-conserving qdisc */ 1291 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1292 { 1293 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1294 1295 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1296 if (!skb) { 1297 skb = sch->dequeue(sch); 1298 1299 if (skb) { 1300 __skb_queue_head(&sch->gso_skb, skb); 1301 /* it's still part of the queue */ 1302 qdisc_qstats_backlog_inc(sch, skb); 1303 qdisc_qlen_inc(sch); 1304 } 1305 } 1306 1307 return skb; 1308 } 1309 1310 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, 1311 struct sk_buff *skb) 1312 { 1313 if (qdisc_is_percpu_stats(sch)) { 1314 qdisc_qstats_cpu_backlog_dec(sch, skb); 1315 qdisc_bstats_cpu_update(sch, skb); 1316 qdisc_qstats_cpu_qlen_dec(sch); 1317 } else { 1318 qdisc_qstats_backlog_dec(sch, skb); 1319 qdisc_bstats_update(sch, skb); 1320 qdisc_qlen_dec(sch); 1321 } 1322 } 1323 1324 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, 1325 unsigned int pkt_len) 1326 { 1327 if (qdisc_is_percpu_stats(sch)) { 1328 qdisc_qstats_cpu_qlen_inc(sch); 1329 this_cpu_add(sch->cpu_qstats->backlog, pkt_len); 1330 } else { 1331 qstats_backlog_add(sch, pkt_len); 1332 qdisc_qlen_inc(sch); 1333 } 1334 } 1335 1336 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1337 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1338 { 1339 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1340 1341 if (skb) { 1342 skb = __skb_dequeue(&sch->gso_skb); 1343 if (qdisc_is_percpu_stats(sch)) { 1344 qdisc_qstats_cpu_backlog_dec(sch, skb); 1345 qdisc_qstats_cpu_qlen_dec(sch); 1346 } else { 1347 qdisc_qstats_backlog_dec(sch, skb); 1348 qdisc_qlen_dec(sch); 1349 } 1350 } else { 1351 skb = sch->dequeue(sch); 1352 } 1353 1354 return skb; 1355 } 1356 1357 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1358 { 1359 /* 1360 * We do not know the backlog in bytes of this list, it 1361 * is up to the caller to correct it 1362 */ 1363 ASSERT_RTNL(); 1364 if (qh->qlen) { 1365 rtnl_kfree_skbs(qh->head, qh->tail); 1366 1367 qh->head = NULL; 1368 qh->tail = NULL; 1369 WRITE_ONCE(qh->qlen, 0); 1370 } 1371 } 1372 1373 static inline void qdisc_reset_queue(struct Qdisc *sch) 1374 { 1375 __qdisc_reset_queue(&sch->q); 1376 } 1377 1378 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1379 struct Qdisc **pold) 1380 { 1381 struct Qdisc *old; 1382 1383 sch_tree_lock(sch); 1384 old = *pold; 1385 *pold = new; 1386 if (old != NULL) 1387 qdisc_purge_queue(old); 1388 sch_tree_unlock(sch); 1389 1390 return old; 1391 } 1392 1393 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1394 { 1395 rtnl_kfree_skbs(skb, skb); 1396 qdisc_qstats_drop(sch); 1397 } 1398 1399 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1400 struct sk_buff **to_free) 1401 { 1402 __qdisc_drop(skb, to_free); 1403 qdisc_qstats_cpu_drop(sch); 1404 1405 return NET_XMIT_DROP; 1406 } 1407 1408 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1409 struct sk_buff **to_free) 1410 { 1411 __qdisc_drop(skb, to_free); 1412 qdisc_qstats_drop(sch); 1413 1414 return NET_XMIT_DROP; 1415 } 1416 1417 static inline int qdisc_drop_reason(struct sk_buff *skb, struct Qdisc *sch, 1418 struct sk_buff **to_free, 1419 enum qdisc_drop_reason reason) 1420 { 1421 tcf_set_qdisc_drop_reason(skb, reason); 1422 return qdisc_drop(skb, sch, to_free); 1423 } 1424 1425 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1426 struct sk_buff **to_free) 1427 { 1428 __qdisc_drop_all(skb, to_free); 1429 qdisc_qstats_drop(sch); 1430 1431 return NET_XMIT_DROP; 1432 } 1433 1434 struct psched_ratecfg { 1435 u64 rate_bytes_ps; /* bytes per second */ 1436 u32 mult; 1437 u16 overhead; 1438 u16 mpu; 1439 u8 linklayer; 1440 u8 shift; 1441 }; 1442 1443 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1444 unsigned int len) 1445 { 1446 len += r->overhead; 1447 1448 if (len < r->mpu) 1449 len = r->mpu; 1450 1451 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1452 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1453 1454 return ((u64)len * r->mult) >> r->shift; 1455 } 1456 1457 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1458 const struct tc_ratespec *conf, 1459 u64 rate64); 1460 1461 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1462 const struct psched_ratecfg *r) 1463 { 1464 memset(res, 0, sizeof(*res)); 1465 1466 /* legacy struct tc_ratespec has a 32bit @rate field 1467 * Qdisc using 64bit rate should add new attributes 1468 * in order to maintain compatibility. 1469 */ 1470 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1471 1472 res->overhead = r->overhead; 1473 res->mpu = r->mpu; 1474 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 1475 } 1476 1477 struct psched_pktrate { 1478 u64 rate_pkts_ps; /* packets per second */ 1479 u32 mult; 1480 u8 shift; 1481 }; 1482 1483 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r, 1484 unsigned int pkt_num) 1485 { 1486 return ((u64)pkt_num * r->mult) >> r->shift; 1487 } 1488 1489 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64); 1490 1491 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 1492 * The fast path only needs to access filter list and to update stats 1493 */ 1494 struct mini_Qdisc { 1495 struct tcf_proto *filter_list; 1496 struct tcf_block *block; 1497 struct gnet_stats_basic_sync __percpu *cpu_bstats; 1498 struct gnet_stats_queue __percpu *cpu_qstats; 1499 unsigned long rcu_state; 1500 }; 1501 1502 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1503 const struct sk_buff *skb) 1504 { 1505 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb); 1506 } 1507 1508 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 1509 { 1510 this_cpu_inc(miniq->cpu_qstats->drops); 1511 } 1512 1513 struct mini_Qdisc_pair { 1514 struct mini_Qdisc miniq1; 1515 struct mini_Qdisc miniq2; 1516 struct mini_Qdisc __rcu **p_miniq; 1517 }; 1518 1519 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1520 struct tcf_proto *tp_head); 1521 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1522 struct mini_Qdisc __rcu **p_miniq); 1523 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, 1524 struct tcf_block *block); 1525 1526 static inline bool mini_qdisc_pair_inited(struct mini_Qdisc_pair *miniqp) 1527 { 1528 return !!miniqp->p_miniq; 1529 } 1530 1531 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx); 1532 1533 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 1534 1535 /* Make sure qdisc is no longer in SCHED state. */ 1536 static inline void qdisc_synchronize(const struct Qdisc *q) 1537 { 1538 while (test_bit(__QDISC_STATE_SCHED, &q->state)) 1539 msleep(1); 1540 } 1541 1542 #endif 1543