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; 781 782 for (; i < dev->num_tx_queues; i++) { 783 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 784 if (qdisc) { 785 spin_lock_bh(qdisc_lock(qdisc)); 786 qdisc_reset(qdisc); 787 spin_unlock_bh(qdisc_lock(qdisc)); 788 } 789 } 790 } 791 792 /* Are all TX queues of the device empty? */ 793 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 794 { 795 unsigned int i; 796 797 rcu_read_lock(); 798 for (i = 0; i < dev->num_tx_queues; i++) { 799 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 800 const struct Qdisc *q = rcu_dereference(txq->qdisc); 801 802 if (!qdisc_is_empty(q)) { 803 rcu_read_unlock(); 804 return false; 805 } 806 } 807 rcu_read_unlock(); 808 return true; 809 } 810 811 /* Are any of the TX qdiscs changing? */ 812 static inline bool qdisc_tx_changing(const struct net_device *dev) 813 { 814 unsigned int i; 815 816 for (i = 0; i < dev->num_tx_queues; i++) { 817 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 818 819 if (rcu_access_pointer(txq->qdisc) != 820 rcu_access_pointer(txq->qdisc_sleeping)) 821 return true; 822 } 823 return false; 824 } 825 826 /* "noqueue" qdisc identified by not having any enqueue, see noqueue_init() */ 827 static inline bool qdisc_txq_has_no_queue(const struct netdev_queue *txq) 828 { 829 struct Qdisc *qdisc = rcu_access_pointer(txq->qdisc); 830 831 return qdisc->enqueue == NULL; 832 } 833 834 /* Is the device using the noop qdisc on all queues? */ 835 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 836 { 837 unsigned int i; 838 839 for (i = 0; i < dev->num_tx_queues; i++) { 840 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 841 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 842 return false; 843 } 844 return true; 845 } 846 847 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 848 { 849 return qdisc_skb_cb(skb)->pkt_len; 850 } 851 852 static inline unsigned int qdisc_pkt_segs(const struct sk_buff *skb) 853 { 854 u32 pkt_segs = qdisc_skb_cb(skb)->pkt_segs; 855 856 DEBUG_NET_WARN_ON_ONCE(pkt_segs != 857 (skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1)); 858 return pkt_segs; 859 } 860 861 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 862 enum net_xmit_qdisc_t { 863 __NET_XMIT_STOLEN = 0x00010000, 864 __NET_XMIT_BYPASS = 0x00020000, 865 }; 866 867 #ifdef CONFIG_NET_CLS_ACT 868 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 869 #else 870 #define net_xmit_drop_count(e) (1) 871 #endif 872 873 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 874 const struct Qdisc *sch) 875 { 876 #ifdef CONFIG_NET_SCHED 877 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 878 879 if (stab) 880 __qdisc_calculate_pkt_len(skb, stab); 881 #endif 882 } 883 884 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 885 struct sk_buff **to_free) 886 { 887 return sch->enqueue(skb, sch, to_free); 888 } 889 890 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats, 891 __u64 bytes, __u64 packets) 892 { 893 u64_stats_update_begin(&bstats->syncp); 894 u64_stats_add(&bstats->bytes, bytes); 895 u64_stats_add(&bstats->packets, packets); 896 u64_stats_update_end(&bstats->syncp); 897 } 898 899 static inline void bstats_update(struct gnet_stats_basic_sync *bstats, 900 const struct sk_buff *skb) 901 { 902 _bstats_update(bstats, qdisc_pkt_len(skb), qdisc_pkt_segs(skb)); 903 } 904 905 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 906 const struct sk_buff *skb) 907 { 908 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb); 909 } 910 911 static inline void qdisc_bstats_update(struct Qdisc *sch, 912 const struct sk_buff *skb) 913 { 914 bstats_update(&sch->bstats, skb); 915 } 916 917 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 918 const struct sk_buff *skb) 919 { 920 sch->qstats.backlog -= qdisc_pkt_len(skb); 921 } 922 923 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 924 const struct sk_buff *skb) 925 { 926 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 927 } 928 929 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 930 const struct sk_buff *skb) 931 { 932 sch->qstats.backlog += qdisc_pkt_len(skb); 933 } 934 935 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 936 const struct sk_buff *skb) 937 { 938 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 939 } 940 941 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 942 { 943 this_cpu_inc(sch->cpu_qstats->qlen); 944 } 945 946 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 947 { 948 this_cpu_dec(sch->cpu_qstats->qlen); 949 } 950 951 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 952 { 953 this_cpu_inc(sch->cpu_qstats->requeues); 954 } 955 956 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 957 { 958 sch->qstats.drops += count; 959 } 960 961 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 962 { 963 qstats->drops++; 964 } 965 966 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 967 { 968 qstats->overlimits++; 969 } 970 971 static inline void qdisc_qstats_drop(struct Qdisc *sch) 972 { 973 qstats_drop_inc(&sch->qstats); 974 } 975 976 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 977 { 978 this_cpu_inc(sch->cpu_qstats->drops); 979 } 980 981 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 982 { 983 sch->qstats.overlimits++; 984 } 985 986 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) 987 { 988 __u32 qlen = qdisc_qlen_sum(sch); 989 990 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); 991 } 992 993 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, 994 __u32 *backlog) 995 { 996 struct gnet_stats_queue qstats = { 0 }; 997 998 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats); 999 *qlen = qstats.qlen + qdisc_qlen(sch); 1000 *backlog = qstats.backlog; 1001 } 1002 1003 static inline void qdisc_purge_queue(struct Qdisc *sch) 1004 { 1005 __u32 qlen, backlog; 1006 1007 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 1008 qdisc_reset(sch); 1009 qdisc_tree_reduce_backlog(sch, qlen, backlog); 1010 } 1011 1012 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 1013 struct qdisc_skb_head *qh) 1014 { 1015 struct sk_buff *last = qh->tail; 1016 1017 if (last) { 1018 skb->next = NULL; 1019 last->next = skb; 1020 qh->tail = skb; 1021 } else { 1022 qh->tail = skb; 1023 qh->head = skb; 1024 } 1025 qh->qlen++; 1026 } 1027 1028 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 1029 { 1030 __qdisc_enqueue_tail(skb, &sch->q); 1031 qdisc_qstats_backlog_inc(sch, skb); 1032 return NET_XMIT_SUCCESS; 1033 } 1034 1035 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 1036 struct qdisc_skb_head *qh) 1037 { 1038 skb->next = qh->head; 1039 1040 if (!qh->head) 1041 qh->tail = skb; 1042 qh->head = skb; 1043 qh->qlen++; 1044 } 1045 1046 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 1047 { 1048 struct sk_buff *skb = qh->head; 1049 1050 if (likely(skb != NULL)) { 1051 qh->head = skb->next; 1052 qh->qlen--; 1053 if (qh->head == NULL) 1054 qh->tail = NULL; 1055 skb->next = NULL; 1056 } 1057 1058 return skb; 1059 } 1060 1061 static inline struct sk_buff *qdisc_dequeue_internal(struct Qdisc *sch, bool direct) 1062 { 1063 struct sk_buff *skb; 1064 1065 skb = __skb_dequeue(&sch->gso_skb); 1066 if (skb) { 1067 sch->q.qlen--; 1068 qdisc_qstats_backlog_dec(sch, skb); 1069 return skb; 1070 } 1071 if (direct) { 1072 skb = __qdisc_dequeue_head(&sch->q); 1073 if (skb) 1074 qdisc_qstats_backlog_dec(sch, skb); 1075 return skb; 1076 } else { 1077 return sch->dequeue(sch); 1078 } 1079 } 1080 1081 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 1082 { 1083 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 1084 1085 if (likely(skb != NULL)) { 1086 qdisc_qstats_backlog_dec(sch, skb); 1087 qdisc_bstats_update(sch, skb); 1088 } 1089 1090 return skb; 1091 } 1092 1093 struct tc_skb_cb { 1094 struct qdisc_skb_cb qdisc_cb; 1095 u32 drop_reason; 1096 1097 u16 zone; /* Only valid if qdisc_skb_cb(skb)->post_ct = true */ 1098 u16 mru; 1099 }; 1100 1101 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) 1102 { 1103 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; 1104 1105 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); 1106 return cb; 1107 } 1108 1109 static inline enum skb_drop_reason 1110 tcf_get_drop_reason(const struct sk_buff *skb) 1111 { 1112 return tc_skb_cb(skb)->drop_reason; 1113 } 1114 1115 static inline void tcf_set_drop_reason(const struct sk_buff *skb, 1116 enum skb_drop_reason reason) 1117 { 1118 tc_skb_cb(skb)->drop_reason = reason; 1119 } 1120 1121 static inline void tcf_kfree_skb_list(struct sk_buff *skb) 1122 { 1123 while (unlikely(skb)) { 1124 struct sk_buff *next = skb->next; 1125 1126 prefetch(next); 1127 kfree_skb_reason(skb, tcf_get_drop_reason(skb)); 1128 skb = next; 1129 } 1130 } 1131 1132 static inline void qdisc_dequeue_drop(struct Qdisc *q, struct sk_buff *skb, 1133 enum skb_drop_reason reason) 1134 { 1135 DEBUG_NET_WARN_ON_ONCE(!(q->flags & TCQ_F_DEQUEUE_DROPS)); 1136 DEBUG_NET_WARN_ON_ONCE(q->flags & TCQ_F_NOLOCK); 1137 1138 tcf_set_drop_reason(skb, reason); 1139 skb->next = q->to_free; 1140 q->to_free = skb; 1141 } 1142 1143 /* Instead of calling kfree_skb() while root qdisc lock is held, 1144 * queue the skb for future freeing at end of __dev_xmit_skb() 1145 */ 1146 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 1147 { 1148 skb->next = *to_free; 1149 *to_free = skb; 1150 } 1151 1152 static inline void __qdisc_drop_all(struct sk_buff *skb, 1153 struct sk_buff **to_free) 1154 { 1155 if (skb->prev) 1156 skb->prev->next = *to_free; 1157 else 1158 skb->next = *to_free; 1159 *to_free = skb; 1160 } 1161 1162 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1163 struct qdisc_skb_head *qh, 1164 struct sk_buff **to_free) 1165 { 1166 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1167 1168 if (likely(skb != NULL)) { 1169 unsigned int len = qdisc_pkt_len(skb); 1170 1171 qdisc_qstats_backlog_dec(sch, skb); 1172 __qdisc_drop(skb, to_free); 1173 return len; 1174 } 1175 1176 return 0; 1177 } 1178 1179 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1180 { 1181 const struct qdisc_skb_head *qh = &sch->q; 1182 1183 return qh->head; 1184 } 1185 1186 /* generic pseudo peek method for non-work-conserving qdisc */ 1187 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1188 { 1189 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1190 1191 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1192 if (!skb) { 1193 skb = sch->dequeue(sch); 1194 1195 if (skb) { 1196 __skb_queue_head(&sch->gso_skb, skb); 1197 /* it's still part of the queue */ 1198 qdisc_qstats_backlog_inc(sch, skb); 1199 sch->q.qlen++; 1200 } 1201 } 1202 1203 return skb; 1204 } 1205 1206 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, 1207 struct sk_buff *skb) 1208 { 1209 if (qdisc_is_percpu_stats(sch)) { 1210 qdisc_qstats_cpu_backlog_dec(sch, skb); 1211 qdisc_bstats_cpu_update(sch, skb); 1212 qdisc_qstats_cpu_qlen_dec(sch); 1213 } else { 1214 qdisc_qstats_backlog_dec(sch, skb); 1215 qdisc_bstats_update(sch, skb); 1216 sch->q.qlen--; 1217 } 1218 } 1219 1220 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, 1221 unsigned int pkt_len) 1222 { 1223 if (qdisc_is_percpu_stats(sch)) { 1224 qdisc_qstats_cpu_qlen_inc(sch); 1225 this_cpu_add(sch->cpu_qstats->backlog, pkt_len); 1226 } else { 1227 sch->qstats.backlog += pkt_len; 1228 sch->q.qlen++; 1229 } 1230 } 1231 1232 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1233 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1234 { 1235 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1236 1237 if (skb) { 1238 skb = __skb_dequeue(&sch->gso_skb); 1239 if (qdisc_is_percpu_stats(sch)) { 1240 qdisc_qstats_cpu_backlog_dec(sch, skb); 1241 qdisc_qstats_cpu_qlen_dec(sch); 1242 } else { 1243 qdisc_qstats_backlog_dec(sch, skb); 1244 sch->q.qlen--; 1245 } 1246 } else { 1247 skb = sch->dequeue(sch); 1248 } 1249 1250 return skb; 1251 } 1252 1253 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1254 { 1255 /* 1256 * We do not know the backlog in bytes of this list, it 1257 * is up to the caller to correct it 1258 */ 1259 ASSERT_RTNL(); 1260 if (qh->qlen) { 1261 rtnl_kfree_skbs(qh->head, qh->tail); 1262 1263 qh->head = NULL; 1264 qh->tail = NULL; 1265 qh->qlen = 0; 1266 } 1267 } 1268 1269 static inline void qdisc_reset_queue(struct Qdisc *sch) 1270 { 1271 __qdisc_reset_queue(&sch->q); 1272 } 1273 1274 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1275 struct Qdisc **pold) 1276 { 1277 struct Qdisc *old; 1278 1279 sch_tree_lock(sch); 1280 old = *pold; 1281 *pold = new; 1282 if (old != NULL) 1283 qdisc_purge_queue(old); 1284 sch_tree_unlock(sch); 1285 1286 return old; 1287 } 1288 1289 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1290 { 1291 rtnl_kfree_skbs(skb, skb); 1292 qdisc_qstats_drop(sch); 1293 } 1294 1295 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1296 struct sk_buff **to_free) 1297 { 1298 __qdisc_drop(skb, to_free); 1299 qdisc_qstats_cpu_drop(sch); 1300 1301 return NET_XMIT_DROP; 1302 } 1303 1304 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1305 struct sk_buff **to_free) 1306 { 1307 __qdisc_drop(skb, to_free); 1308 qdisc_qstats_drop(sch); 1309 1310 return NET_XMIT_DROP; 1311 } 1312 1313 static inline int qdisc_drop_reason(struct sk_buff *skb, struct Qdisc *sch, 1314 struct sk_buff **to_free, 1315 enum skb_drop_reason reason) 1316 { 1317 tcf_set_drop_reason(skb, reason); 1318 return qdisc_drop(skb, sch, to_free); 1319 } 1320 1321 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1322 struct sk_buff **to_free) 1323 { 1324 __qdisc_drop_all(skb, to_free); 1325 qdisc_qstats_drop(sch); 1326 1327 return NET_XMIT_DROP; 1328 } 1329 1330 struct psched_ratecfg { 1331 u64 rate_bytes_ps; /* bytes per second */ 1332 u32 mult; 1333 u16 overhead; 1334 u16 mpu; 1335 u8 linklayer; 1336 u8 shift; 1337 }; 1338 1339 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1340 unsigned int len) 1341 { 1342 len += r->overhead; 1343 1344 if (len < r->mpu) 1345 len = r->mpu; 1346 1347 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1348 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1349 1350 return ((u64)len * r->mult) >> r->shift; 1351 } 1352 1353 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1354 const struct tc_ratespec *conf, 1355 u64 rate64); 1356 1357 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1358 const struct psched_ratecfg *r) 1359 { 1360 memset(res, 0, sizeof(*res)); 1361 1362 /* legacy struct tc_ratespec has a 32bit @rate field 1363 * Qdisc using 64bit rate should add new attributes 1364 * in order to maintain compatibility. 1365 */ 1366 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1367 1368 res->overhead = r->overhead; 1369 res->mpu = r->mpu; 1370 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 1371 } 1372 1373 struct psched_pktrate { 1374 u64 rate_pkts_ps; /* packets per second */ 1375 u32 mult; 1376 u8 shift; 1377 }; 1378 1379 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r, 1380 unsigned int pkt_num) 1381 { 1382 return ((u64)pkt_num * r->mult) >> r->shift; 1383 } 1384 1385 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64); 1386 1387 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 1388 * The fast path only needs to access filter list and to update stats 1389 */ 1390 struct mini_Qdisc { 1391 struct tcf_proto *filter_list; 1392 struct tcf_block *block; 1393 struct gnet_stats_basic_sync __percpu *cpu_bstats; 1394 struct gnet_stats_queue __percpu *cpu_qstats; 1395 unsigned long rcu_state; 1396 }; 1397 1398 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1399 const struct sk_buff *skb) 1400 { 1401 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb); 1402 } 1403 1404 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 1405 { 1406 this_cpu_inc(miniq->cpu_qstats->drops); 1407 } 1408 1409 struct mini_Qdisc_pair { 1410 struct mini_Qdisc miniq1; 1411 struct mini_Qdisc miniq2; 1412 struct mini_Qdisc __rcu **p_miniq; 1413 }; 1414 1415 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1416 struct tcf_proto *tp_head); 1417 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1418 struct mini_Qdisc __rcu **p_miniq); 1419 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, 1420 struct tcf_block *block); 1421 1422 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx); 1423 1424 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 1425 1426 /* Make sure qdisc is no longer in SCHED state. */ 1427 static inline void qdisc_synchronize(const struct Qdisc *q) 1428 { 1429 while (test_bit(__QDISC_STATE_SCHED, &q->state)) 1430 msleep(1); 1431 } 1432 1433 #endif 1434