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_decrease_qlen() 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_sum(const struct Qdisc *q) 546 { 547 __u32 qlen = q->qstats.qlen; 548 int i; 549 550 if (qdisc_is_percpu_stats(q)) { 551 for_each_possible_cpu(i) 552 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; 553 } else { 554 qlen += q->q.qlen; 555 } 556 557 return qlen; 558 } 559 560 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 561 { 562 return (struct qdisc_skb_cb *)skb->cb; 563 } 564 565 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 566 { 567 return &qdisc->q.lock; 568 } 569 570 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 571 { 572 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 573 574 return q; 575 } 576 577 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) 578 { 579 return rcu_dereference_bh(qdisc->dev_queue->qdisc); 580 } 581 582 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 583 { 584 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping); 585 } 586 587 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 588 { 589 struct Qdisc *root = qdisc_root_sleeping(qdisc); 590 591 ASSERT_RTNL(); 592 return qdisc_lock(root); 593 } 594 595 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 596 { 597 return qdisc->dev_queue->dev; 598 } 599 600 static inline void sch_tree_lock(struct Qdisc *q) 601 { 602 if (q->flags & TCQ_F_MQROOT) 603 spin_lock_bh(qdisc_lock(q)); 604 else 605 spin_lock_bh(qdisc_root_sleeping_lock(q)); 606 } 607 608 static inline void sch_tree_unlock(struct Qdisc *q) 609 { 610 if (q->flags & TCQ_F_MQROOT) 611 spin_unlock_bh(qdisc_lock(q)); 612 else 613 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 614 } 615 616 extern struct Qdisc noop_qdisc; 617 extern struct Qdisc_ops noop_qdisc_ops; 618 extern struct Qdisc_ops pfifo_fast_ops; 619 extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1]; 620 extern struct Qdisc_ops mq_qdisc_ops; 621 extern struct Qdisc_ops noqueue_qdisc_ops; 622 extern const struct Qdisc_ops *default_qdisc_ops; 623 static inline const struct Qdisc_ops * 624 get_default_qdisc_ops(const struct net_device *dev, int ntx) 625 { 626 return ntx < dev->real_num_tx_queues ? 627 default_qdisc_ops : &pfifo_fast_ops; 628 } 629 630 struct Qdisc_class_common { 631 u32 classid; 632 unsigned int filter_cnt; 633 struct hlist_node hnode; 634 }; 635 636 struct Qdisc_class_hash { 637 struct hlist_head *hash; 638 unsigned int hashsize; 639 unsigned int hashmask; 640 unsigned int hashelems; 641 }; 642 643 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 644 { 645 id ^= id >> 8; 646 id ^= id >> 4; 647 return id & mask; 648 } 649 650 static inline struct Qdisc_class_common * 651 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 652 { 653 struct Qdisc_class_common *cl; 654 unsigned int h; 655 656 if (!id) 657 return NULL; 658 659 h = qdisc_class_hash(id, hash->hashmask); 660 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 661 if (cl->classid == id) 662 return cl; 663 } 664 return NULL; 665 } 666 667 static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl) 668 { 669 return cl->filter_cnt > 0; 670 } 671 672 static inline void qdisc_class_get(struct Qdisc_class_common *cl) 673 { 674 unsigned int res; 675 676 if (check_add_overflow(cl->filter_cnt, 1, &res)) 677 WARN(1, "Qdisc class overflow"); 678 679 cl->filter_cnt = res; 680 } 681 682 static inline void qdisc_class_put(struct Qdisc_class_common *cl) 683 { 684 unsigned int res; 685 686 if (check_sub_overflow(cl->filter_cnt, 1, &res)) 687 WARN(1, "Qdisc class underflow"); 688 689 cl->filter_cnt = res; 690 } 691 692 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 693 { 694 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 695 696 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 697 } 698 699 int qdisc_class_hash_init(struct Qdisc_class_hash *); 700 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 701 struct Qdisc_class_common *); 702 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 703 struct Qdisc_class_common *); 704 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 705 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 706 707 int dev_qdisc_change_tx_queue_len(struct net_device *dev); 708 void dev_qdisc_change_real_num_tx(struct net_device *dev, 709 unsigned int new_real_tx); 710 void dev_init_scheduler(struct net_device *dev); 711 void dev_shutdown(struct net_device *dev); 712 void dev_activate(struct net_device *dev); 713 void dev_deactivate(struct net_device *dev, bool reset_needed); 714 void dev_deactivate_many(struct list_head *head, bool reset_needed); 715 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 716 struct Qdisc *qdisc); 717 void qdisc_reset(struct Qdisc *qdisc); 718 void qdisc_destroy(struct Qdisc *qdisc); 719 void qdisc_put(struct Qdisc *qdisc); 720 void qdisc_put_unlocked(struct Qdisc *qdisc); 721 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); 722 #ifdef CONFIG_NET_SCHED 723 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 724 void *type_data); 725 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 726 struct Qdisc *new, struct Qdisc *old, 727 enum tc_setup_type type, void *type_data, 728 struct netlink_ext_ack *extack); 729 #else 730 static inline int 731 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 732 void *type_data) 733 { 734 q->flags &= ~TCQ_F_OFFLOADED; 735 return 0; 736 } 737 738 static inline void 739 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 740 struct Qdisc *new, struct Qdisc *old, 741 enum tc_setup_type type, void *type_data, 742 struct netlink_ext_ack *extack) 743 { 744 } 745 #endif 746 void qdisc_offload_query_caps(struct net_device *dev, 747 enum tc_setup_type type, 748 void *caps, size_t caps_len); 749 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 750 const struct Qdisc_ops *ops, 751 struct netlink_ext_ack *extack); 752 void qdisc_free(struct Qdisc *qdisc); 753 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 754 const struct Qdisc_ops *ops, u32 parentid, 755 struct netlink_ext_ack *extack); 756 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 757 const struct qdisc_size_table *stab); 758 int skb_do_redirect(struct sk_buff *); 759 760 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 761 { 762 #ifdef CONFIG_NET_XGRESS 763 return skb->tc_at_ingress; 764 #else 765 return false; 766 #endif 767 } 768 769 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 770 { 771 #ifdef CONFIG_NET_CLS_ACT 772 if (skb->tc_skip_classify) { 773 skb->tc_skip_classify = 0; 774 return true; 775 } 776 #endif 777 return false; 778 } 779 780 /* Reset all TX qdiscs greater than index of a device. */ 781 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 782 { 783 struct Qdisc *qdisc; 784 bool nolock; 785 786 for (; i < dev->num_tx_queues; i++) { 787 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 788 if (qdisc) { 789 nolock = qdisc->flags & TCQ_F_NOLOCK; 790 791 if (nolock) 792 spin_lock_bh(&qdisc->seqlock); 793 spin_lock_bh(qdisc_lock(qdisc)); 794 qdisc_reset(qdisc); 795 spin_unlock_bh(qdisc_lock(qdisc)); 796 if (nolock) { 797 clear_bit(__QDISC_STATE_MISSED, &qdisc->state); 798 clear_bit(__QDISC_STATE_DRAINING, &qdisc->state); 799 spin_unlock_bh(&qdisc->seqlock); 800 } 801 } 802 } 803 } 804 805 /* Are all TX queues of the device empty? */ 806 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 807 { 808 unsigned int i; 809 810 rcu_read_lock(); 811 for (i = 0; i < dev->num_tx_queues; i++) { 812 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 813 const struct Qdisc *q = rcu_dereference(txq->qdisc); 814 815 if (!qdisc_is_empty(q)) { 816 rcu_read_unlock(); 817 return false; 818 } 819 } 820 rcu_read_unlock(); 821 return true; 822 } 823 824 /* Are any of the TX qdiscs changing? */ 825 static inline bool qdisc_tx_changing(const struct net_device *dev) 826 { 827 unsigned int i; 828 829 for (i = 0; i < dev->num_tx_queues; i++) { 830 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 831 832 if (rcu_access_pointer(txq->qdisc) != 833 rcu_access_pointer(txq->qdisc_sleeping)) 834 return true; 835 } 836 return false; 837 } 838 839 /* "noqueue" qdisc identified by not having any enqueue, see noqueue_init() */ 840 static inline bool qdisc_txq_has_no_queue(const struct netdev_queue *txq) 841 { 842 struct Qdisc *qdisc = rcu_access_pointer(txq->qdisc); 843 844 return qdisc->enqueue == NULL; 845 } 846 847 /* Is the device using the noop qdisc on all queues? */ 848 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 849 { 850 unsigned int i; 851 852 for (i = 0; i < dev->num_tx_queues; i++) { 853 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 854 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 855 return false; 856 } 857 return true; 858 } 859 860 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 861 { 862 return qdisc_skb_cb(skb)->pkt_len; 863 } 864 865 static inline unsigned int qdisc_pkt_segs(const struct sk_buff *skb) 866 { 867 u32 pkt_segs = qdisc_skb_cb(skb)->pkt_segs; 868 869 DEBUG_NET_WARN_ON_ONCE(pkt_segs != 870 (skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1)); 871 return pkt_segs; 872 } 873 874 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 875 enum net_xmit_qdisc_t { 876 __NET_XMIT_STOLEN = 0x00010000, 877 __NET_XMIT_BYPASS = 0x00020000, 878 }; 879 880 #ifdef CONFIG_NET_CLS_ACT 881 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 882 #else 883 #define net_xmit_drop_count(e) (1) 884 #endif 885 886 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 887 const struct Qdisc *sch) 888 { 889 #ifdef CONFIG_NET_SCHED 890 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 891 892 if (stab) 893 __qdisc_calculate_pkt_len(skb, stab); 894 #endif 895 } 896 897 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 898 struct sk_buff **to_free) 899 { 900 return sch->enqueue(skb, sch, to_free); 901 } 902 903 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats, 904 __u64 bytes, __u64 packets) 905 { 906 u64_stats_update_begin(&bstats->syncp); 907 u64_stats_add(&bstats->bytes, bytes); 908 u64_stats_add(&bstats->packets, packets); 909 u64_stats_update_end(&bstats->syncp); 910 } 911 912 static inline void bstats_update(struct gnet_stats_basic_sync *bstats, 913 const struct sk_buff *skb) 914 { 915 _bstats_update(bstats, qdisc_pkt_len(skb), qdisc_pkt_segs(skb)); 916 } 917 918 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 919 const struct sk_buff *skb) 920 { 921 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb); 922 } 923 924 static inline void qdisc_bstats_update(struct Qdisc *sch, 925 const struct sk_buff *skb) 926 { 927 bstats_update(&sch->bstats, skb); 928 } 929 930 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 931 const struct sk_buff *skb) 932 { 933 sch->qstats.backlog -= qdisc_pkt_len(skb); 934 } 935 936 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 937 const struct sk_buff *skb) 938 { 939 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 940 } 941 942 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 943 const struct sk_buff *skb) 944 { 945 sch->qstats.backlog += qdisc_pkt_len(skb); 946 } 947 948 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 949 const struct sk_buff *skb) 950 { 951 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 952 } 953 954 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 955 { 956 this_cpu_inc(sch->cpu_qstats->qlen); 957 } 958 959 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 960 { 961 this_cpu_dec(sch->cpu_qstats->qlen); 962 } 963 964 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 965 { 966 this_cpu_inc(sch->cpu_qstats->requeues); 967 } 968 969 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 970 { 971 sch->qstats.drops += count; 972 } 973 974 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 975 { 976 qstats->drops++; 977 } 978 979 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 980 { 981 qstats->overlimits++; 982 } 983 984 static inline void qdisc_qstats_drop(struct Qdisc *sch) 985 { 986 qstats_drop_inc(&sch->qstats); 987 } 988 989 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 990 { 991 this_cpu_inc(sch->cpu_qstats->drops); 992 } 993 994 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 995 { 996 sch->qstats.overlimits++; 997 } 998 999 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) 1000 { 1001 __u32 qlen = qdisc_qlen_sum(sch); 1002 1003 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); 1004 } 1005 1006 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, 1007 __u32 *backlog) 1008 { 1009 struct gnet_stats_queue qstats = { 0 }; 1010 1011 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats); 1012 *qlen = qstats.qlen + qdisc_qlen(sch); 1013 *backlog = qstats.backlog; 1014 } 1015 1016 static inline void qdisc_purge_queue(struct Qdisc *sch) 1017 { 1018 __u32 qlen, backlog; 1019 1020 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 1021 qdisc_reset(sch); 1022 qdisc_tree_reduce_backlog(sch, qlen, backlog); 1023 } 1024 1025 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 1026 struct qdisc_skb_head *qh) 1027 { 1028 struct sk_buff *last = qh->tail; 1029 1030 if (last) { 1031 skb->next = NULL; 1032 last->next = skb; 1033 qh->tail = skb; 1034 } else { 1035 qh->tail = skb; 1036 qh->head = skb; 1037 } 1038 qh->qlen++; 1039 } 1040 1041 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 1042 { 1043 __qdisc_enqueue_tail(skb, &sch->q); 1044 qdisc_qstats_backlog_inc(sch, skb); 1045 return NET_XMIT_SUCCESS; 1046 } 1047 1048 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 1049 struct qdisc_skb_head *qh) 1050 { 1051 skb->next = qh->head; 1052 1053 if (!qh->head) 1054 qh->tail = skb; 1055 qh->head = skb; 1056 qh->qlen++; 1057 } 1058 1059 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 1060 { 1061 struct sk_buff *skb = qh->head; 1062 1063 if (likely(skb != NULL)) { 1064 qh->head = skb->next; 1065 qh->qlen--; 1066 if (qh->head == NULL) 1067 qh->tail = NULL; 1068 skb->next = NULL; 1069 } 1070 1071 return skb; 1072 } 1073 1074 static inline struct sk_buff *qdisc_dequeue_internal(struct Qdisc *sch, bool direct) 1075 { 1076 struct sk_buff *skb; 1077 1078 skb = __skb_dequeue(&sch->gso_skb); 1079 if (skb) { 1080 sch->q.qlen--; 1081 qdisc_qstats_backlog_dec(sch, skb); 1082 return skb; 1083 } 1084 if (direct) { 1085 skb = __qdisc_dequeue_head(&sch->q); 1086 if (skb) 1087 qdisc_qstats_backlog_dec(sch, skb); 1088 return skb; 1089 } else { 1090 return sch->dequeue(sch); 1091 } 1092 } 1093 1094 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 1095 { 1096 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 1097 1098 if (likely(skb != NULL)) { 1099 qdisc_qstats_backlog_dec(sch, skb); 1100 qdisc_bstats_update(sch, skb); 1101 } 1102 1103 return skb; 1104 } 1105 1106 struct tc_skb_cb { 1107 struct qdisc_skb_cb qdisc_cb; 1108 u32 drop_reason; 1109 1110 u16 zone; /* Only valid if qdisc_skb_cb(skb)->post_ct = true */ 1111 u16 mru; 1112 }; 1113 1114 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) 1115 { 1116 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; 1117 1118 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); 1119 return cb; 1120 } 1121 1122 /* TC classifier accessors - use enum skb_drop_reason */ 1123 static inline enum skb_drop_reason 1124 tcf_get_drop_reason(const struct sk_buff *skb) 1125 { 1126 return (enum skb_drop_reason)tc_skb_cb(skb)->drop_reason; 1127 } 1128 1129 static inline void tcf_set_drop_reason(const struct sk_buff *skb, 1130 enum skb_drop_reason reason) 1131 { 1132 tc_skb_cb(skb)->drop_reason = (enum qdisc_drop_reason)reason; 1133 } 1134 1135 /* Qdisc accessors - use enum qdisc_drop_reason */ 1136 static inline enum qdisc_drop_reason 1137 tcf_get_qdisc_drop_reason(const struct sk_buff *skb) 1138 { 1139 return tc_skb_cb(skb)->drop_reason; 1140 } 1141 1142 static inline void tcf_set_qdisc_drop_reason(const struct sk_buff *skb, 1143 enum qdisc_drop_reason reason) 1144 { 1145 tc_skb_cb(skb)->drop_reason = reason; 1146 } 1147 1148 void __tcf_kfree_skb_list(struct sk_buff *skb, struct Qdisc *q, 1149 struct netdev_queue *txq, struct net_device *dev); 1150 1151 static inline void tcf_kfree_skb_list(struct sk_buff *skb, struct Qdisc *q, 1152 struct netdev_queue *txq, 1153 struct net_device *dev) 1154 { 1155 if (unlikely(skb)) 1156 __tcf_kfree_skb_list(skb, q, txq, dev); 1157 } 1158 1159 static inline void qdisc_dequeue_drop(struct Qdisc *q, struct sk_buff *skb, 1160 enum qdisc_drop_reason reason) 1161 { 1162 DEBUG_NET_WARN_ON_ONCE(!(q->flags & TCQ_F_DEQUEUE_DROPS)); 1163 DEBUG_NET_WARN_ON_ONCE(q->flags & TCQ_F_NOLOCK); 1164 1165 tcf_set_qdisc_drop_reason(skb, reason); 1166 skb->next = q->to_free; 1167 q->to_free = skb; 1168 } 1169 1170 /* Instead of calling kfree_skb() while root qdisc lock is held, 1171 * queue the skb for future freeing at end of __dev_xmit_skb() 1172 */ 1173 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 1174 { 1175 skb->next = *to_free; 1176 *to_free = skb; 1177 } 1178 1179 static inline void __qdisc_drop_all(struct sk_buff *skb, 1180 struct sk_buff **to_free) 1181 { 1182 if (skb->prev) 1183 skb->prev->next = *to_free; 1184 else 1185 skb->next = *to_free; 1186 *to_free = skb; 1187 } 1188 1189 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1190 struct qdisc_skb_head *qh, 1191 struct sk_buff **to_free) 1192 { 1193 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1194 1195 if (likely(skb != NULL)) { 1196 unsigned int len = qdisc_pkt_len(skb); 1197 1198 qdisc_qstats_backlog_dec(sch, skb); 1199 __qdisc_drop(skb, to_free); 1200 return len; 1201 } 1202 1203 return 0; 1204 } 1205 1206 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1207 { 1208 const struct qdisc_skb_head *qh = &sch->q; 1209 1210 return qh->head; 1211 } 1212 1213 /* generic pseudo peek method for non-work-conserving qdisc */ 1214 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1215 { 1216 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1217 1218 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1219 if (!skb) { 1220 skb = sch->dequeue(sch); 1221 1222 if (skb) { 1223 __skb_queue_head(&sch->gso_skb, skb); 1224 /* it's still part of the queue */ 1225 qdisc_qstats_backlog_inc(sch, skb); 1226 sch->q.qlen++; 1227 } 1228 } 1229 1230 return skb; 1231 } 1232 1233 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, 1234 struct sk_buff *skb) 1235 { 1236 if (qdisc_is_percpu_stats(sch)) { 1237 qdisc_qstats_cpu_backlog_dec(sch, skb); 1238 qdisc_bstats_cpu_update(sch, skb); 1239 qdisc_qstats_cpu_qlen_dec(sch); 1240 } else { 1241 qdisc_qstats_backlog_dec(sch, skb); 1242 qdisc_bstats_update(sch, skb); 1243 sch->q.qlen--; 1244 } 1245 } 1246 1247 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, 1248 unsigned int pkt_len) 1249 { 1250 if (qdisc_is_percpu_stats(sch)) { 1251 qdisc_qstats_cpu_qlen_inc(sch); 1252 this_cpu_add(sch->cpu_qstats->backlog, pkt_len); 1253 } else { 1254 sch->qstats.backlog += pkt_len; 1255 sch->q.qlen++; 1256 } 1257 } 1258 1259 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1260 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1261 { 1262 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1263 1264 if (skb) { 1265 skb = __skb_dequeue(&sch->gso_skb); 1266 if (qdisc_is_percpu_stats(sch)) { 1267 qdisc_qstats_cpu_backlog_dec(sch, skb); 1268 qdisc_qstats_cpu_qlen_dec(sch); 1269 } else { 1270 qdisc_qstats_backlog_dec(sch, skb); 1271 sch->q.qlen--; 1272 } 1273 } else { 1274 skb = sch->dequeue(sch); 1275 } 1276 1277 return skb; 1278 } 1279 1280 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1281 { 1282 /* 1283 * We do not know the backlog in bytes of this list, it 1284 * is up to the caller to correct it 1285 */ 1286 ASSERT_RTNL(); 1287 if (qh->qlen) { 1288 rtnl_kfree_skbs(qh->head, qh->tail); 1289 1290 qh->head = NULL; 1291 qh->tail = NULL; 1292 qh->qlen = 0; 1293 } 1294 } 1295 1296 static inline void qdisc_reset_queue(struct Qdisc *sch) 1297 { 1298 __qdisc_reset_queue(&sch->q); 1299 } 1300 1301 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1302 struct Qdisc **pold) 1303 { 1304 struct Qdisc *old; 1305 1306 sch_tree_lock(sch); 1307 old = *pold; 1308 *pold = new; 1309 if (old != NULL) 1310 qdisc_purge_queue(old); 1311 sch_tree_unlock(sch); 1312 1313 return old; 1314 } 1315 1316 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1317 { 1318 rtnl_kfree_skbs(skb, skb); 1319 qdisc_qstats_drop(sch); 1320 } 1321 1322 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1323 struct sk_buff **to_free) 1324 { 1325 __qdisc_drop(skb, to_free); 1326 qdisc_qstats_cpu_drop(sch); 1327 1328 return NET_XMIT_DROP; 1329 } 1330 1331 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1332 struct sk_buff **to_free) 1333 { 1334 __qdisc_drop(skb, to_free); 1335 qdisc_qstats_drop(sch); 1336 1337 return NET_XMIT_DROP; 1338 } 1339 1340 static inline int qdisc_drop_reason(struct sk_buff *skb, struct Qdisc *sch, 1341 struct sk_buff **to_free, 1342 enum qdisc_drop_reason reason) 1343 { 1344 tcf_set_qdisc_drop_reason(skb, reason); 1345 return qdisc_drop(skb, sch, to_free); 1346 } 1347 1348 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1349 struct sk_buff **to_free) 1350 { 1351 __qdisc_drop_all(skb, to_free); 1352 qdisc_qstats_drop(sch); 1353 1354 return NET_XMIT_DROP; 1355 } 1356 1357 struct psched_ratecfg { 1358 u64 rate_bytes_ps; /* bytes per second */ 1359 u32 mult; 1360 u16 overhead; 1361 u16 mpu; 1362 u8 linklayer; 1363 u8 shift; 1364 }; 1365 1366 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1367 unsigned int len) 1368 { 1369 len += r->overhead; 1370 1371 if (len < r->mpu) 1372 len = r->mpu; 1373 1374 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1375 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1376 1377 return ((u64)len * r->mult) >> r->shift; 1378 } 1379 1380 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1381 const struct tc_ratespec *conf, 1382 u64 rate64); 1383 1384 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1385 const struct psched_ratecfg *r) 1386 { 1387 memset(res, 0, sizeof(*res)); 1388 1389 /* legacy struct tc_ratespec has a 32bit @rate field 1390 * Qdisc using 64bit rate should add new attributes 1391 * in order to maintain compatibility. 1392 */ 1393 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1394 1395 res->overhead = r->overhead; 1396 res->mpu = r->mpu; 1397 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 1398 } 1399 1400 struct psched_pktrate { 1401 u64 rate_pkts_ps; /* packets per second */ 1402 u32 mult; 1403 u8 shift; 1404 }; 1405 1406 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r, 1407 unsigned int pkt_num) 1408 { 1409 return ((u64)pkt_num * r->mult) >> r->shift; 1410 } 1411 1412 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64); 1413 1414 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 1415 * The fast path only needs to access filter list and to update stats 1416 */ 1417 struct mini_Qdisc { 1418 struct tcf_proto *filter_list; 1419 struct tcf_block *block; 1420 struct gnet_stats_basic_sync __percpu *cpu_bstats; 1421 struct gnet_stats_queue __percpu *cpu_qstats; 1422 unsigned long rcu_state; 1423 }; 1424 1425 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1426 const struct sk_buff *skb) 1427 { 1428 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb); 1429 } 1430 1431 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 1432 { 1433 this_cpu_inc(miniq->cpu_qstats->drops); 1434 } 1435 1436 struct mini_Qdisc_pair { 1437 struct mini_Qdisc miniq1; 1438 struct mini_Qdisc miniq2; 1439 struct mini_Qdisc __rcu **p_miniq; 1440 }; 1441 1442 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1443 struct tcf_proto *tp_head); 1444 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1445 struct mini_Qdisc __rcu **p_miniq); 1446 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, 1447 struct tcf_block *block); 1448 1449 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx); 1450 1451 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 1452 1453 /* Make sure qdisc is no longer in SCHED state. */ 1454 static inline void qdisc_synchronize(const struct Qdisc *q) 1455 { 1456 while (test_bit(__QDISC_STATE_SCHED, &q->state)) 1457 msleep(1); 1458 } 1459 1460 #endif 1461