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