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 <net/gen_stats.h> 17 #include <net/rtnetlink.h> 18 19 struct Qdisc_ops; 20 struct qdisc_walker; 21 struct tcf_walker; 22 struct module; 23 struct bpf_flow_keys; 24 25 typedef int tc_setup_cb_t(enum tc_setup_type type, 26 void *type_data, void *cb_priv); 27 28 typedef int tc_indr_block_bind_cb_t(struct net_device *dev, void *cb_priv, 29 enum tc_setup_type type, void *type_data); 30 31 struct qdisc_rate_table { 32 struct tc_ratespec rate; 33 u32 data[256]; 34 struct qdisc_rate_table *next; 35 int refcnt; 36 }; 37 38 enum qdisc_state_t { 39 __QDISC_STATE_SCHED, 40 __QDISC_STATE_DEACTIVATED, 41 }; 42 43 struct qdisc_size_table { 44 struct rcu_head rcu; 45 struct list_head list; 46 struct tc_sizespec szopts; 47 int refcnt; 48 u16 data[]; 49 }; 50 51 /* similar to sk_buff_head, but skb->prev pointer is undefined. */ 52 struct qdisc_skb_head { 53 struct sk_buff *head; 54 struct sk_buff *tail; 55 union { 56 u32 qlen; 57 atomic_t atomic_qlen; 58 }; 59 spinlock_t lock; 60 }; 61 62 struct Qdisc { 63 int (*enqueue)(struct sk_buff *skb, 64 struct Qdisc *sch, 65 struct sk_buff **to_free); 66 struct sk_buff * (*dequeue)(struct Qdisc *sch); 67 unsigned int flags; 68 #define TCQ_F_BUILTIN 1 69 #define TCQ_F_INGRESS 2 70 #define TCQ_F_CAN_BYPASS 4 71 #define TCQ_F_MQROOT 8 72 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for 73 * q->dev_queue : It can test 74 * netif_xmit_frozen_or_stopped() before 75 * dequeueing next packet. 76 * Its true for MQ/MQPRIO slaves, or non 77 * multiqueue device. 78 */ 79 #define TCQ_F_WARN_NONWC (1 << 16) 80 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ 81 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : 82 * qdisc_tree_decrease_qlen() should stop. 83 */ 84 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ 85 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ 86 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ 87 u32 limit; 88 const struct Qdisc_ops *ops; 89 struct qdisc_size_table __rcu *stab; 90 struct hlist_node hash; 91 u32 handle; 92 u32 parent; 93 94 struct netdev_queue *dev_queue; 95 96 struct net_rate_estimator __rcu *rate_est; 97 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 98 struct gnet_stats_queue __percpu *cpu_qstats; 99 int padded; 100 refcount_t refcnt; 101 102 /* 103 * For performance sake on SMP, we put highly modified fields at the end 104 */ 105 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; 106 struct qdisc_skb_head q; 107 struct gnet_stats_basic_packed bstats; 108 seqcount_t running; 109 struct gnet_stats_queue qstats; 110 unsigned long state; 111 struct Qdisc *next_sched; 112 struct sk_buff_head skb_bad_txq; 113 114 spinlock_t busylock ____cacheline_aligned_in_smp; 115 spinlock_t seqlock; 116 struct rcu_head rcu; 117 }; 118 119 static inline void qdisc_refcount_inc(struct Qdisc *qdisc) 120 { 121 if (qdisc->flags & TCQ_F_BUILTIN) 122 return; 123 refcount_inc(&qdisc->refcnt); 124 } 125 126 /* Intended to be used by unlocked users, when concurrent qdisc release is 127 * possible. 128 */ 129 130 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) 131 { 132 if (qdisc->flags & TCQ_F_BUILTIN) 133 return qdisc; 134 if (refcount_inc_not_zero(&qdisc->refcnt)) 135 return qdisc; 136 return NULL; 137 } 138 139 static inline bool qdisc_is_running(struct Qdisc *qdisc) 140 { 141 if (qdisc->flags & TCQ_F_NOLOCK) 142 return spin_is_locked(&qdisc->seqlock); 143 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; 144 } 145 146 static inline bool qdisc_run_begin(struct Qdisc *qdisc) 147 { 148 if (qdisc->flags & TCQ_F_NOLOCK) { 149 if (!spin_trylock(&qdisc->seqlock)) 150 return false; 151 } else if (qdisc_is_running(qdisc)) { 152 return false; 153 } 154 /* Variant of write_seqcount_begin() telling lockdep a trylock 155 * was attempted. 156 */ 157 raw_write_seqcount_begin(&qdisc->running); 158 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); 159 return true; 160 } 161 162 static inline void qdisc_run_end(struct Qdisc *qdisc) 163 { 164 write_seqcount_end(&qdisc->running); 165 if (qdisc->flags & TCQ_F_NOLOCK) 166 spin_unlock(&qdisc->seqlock); 167 } 168 169 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) 170 { 171 return qdisc->flags & TCQ_F_ONETXQUEUE; 172 } 173 174 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) 175 { 176 #ifdef CONFIG_BQL 177 /* Non-BQL migrated drivers will return 0, too. */ 178 return dql_avail(&txq->dql); 179 #else 180 return 0; 181 #endif 182 } 183 184 struct Qdisc_class_ops { 185 unsigned int flags; 186 /* Child qdisc manipulation */ 187 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); 188 int (*graft)(struct Qdisc *, unsigned long cl, 189 struct Qdisc *, struct Qdisc **, 190 struct netlink_ext_ack *extack); 191 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); 192 void (*qlen_notify)(struct Qdisc *, unsigned long); 193 194 /* Class manipulation routines */ 195 unsigned long (*find)(struct Qdisc *, u32 classid); 196 int (*change)(struct Qdisc *, u32, u32, 197 struct nlattr **, unsigned long *, 198 struct netlink_ext_ack *); 199 int (*delete)(struct Qdisc *, unsigned long); 200 void (*walk)(struct Qdisc *, struct qdisc_walker * arg); 201 202 /* Filter manipulation */ 203 struct tcf_block * (*tcf_block)(struct Qdisc *sch, 204 unsigned long arg, 205 struct netlink_ext_ack *extack); 206 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, 207 u32 classid); 208 void (*unbind_tcf)(struct Qdisc *, unsigned long); 209 210 /* rtnetlink specific */ 211 int (*dump)(struct Qdisc *, unsigned long, 212 struct sk_buff *skb, struct tcmsg*); 213 int (*dump_stats)(struct Qdisc *, unsigned long, 214 struct gnet_dump *); 215 }; 216 217 /* Qdisc_class_ops flag values */ 218 219 /* Implements API that doesn't require rtnl lock */ 220 enum qdisc_class_ops_flags { 221 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, 222 }; 223 224 struct Qdisc_ops { 225 struct Qdisc_ops *next; 226 const struct Qdisc_class_ops *cl_ops; 227 char id[IFNAMSIZ]; 228 int priv_size; 229 unsigned int static_flags; 230 231 int (*enqueue)(struct sk_buff *skb, 232 struct Qdisc *sch, 233 struct sk_buff **to_free); 234 struct sk_buff * (*dequeue)(struct Qdisc *); 235 struct sk_buff * (*peek)(struct Qdisc *); 236 237 int (*init)(struct Qdisc *sch, struct nlattr *arg, 238 struct netlink_ext_ack *extack); 239 void (*reset)(struct Qdisc *); 240 void (*destroy)(struct Qdisc *); 241 int (*change)(struct Qdisc *sch, 242 struct nlattr *arg, 243 struct netlink_ext_ack *extack); 244 void (*attach)(struct Qdisc *sch); 245 int (*change_tx_queue_len)(struct Qdisc *, unsigned int); 246 247 int (*dump)(struct Qdisc *, struct sk_buff *); 248 int (*dump_stats)(struct Qdisc *, struct gnet_dump *); 249 250 void (*ingress_block_set)(struct Qdisc *sch, 251 u32 block_index); 252 void (*egress_block_set)(struct Qdisc *sch, 253 u32 block_index); 254 u32 (*ingress_block_get)(struct Qdisc *sch); 255 u32 (*egress_block_get)(struct Qdisc *sch); 256 257 struct module *owner; 258 }; 259 260 261 struct tcf_result { 262 union { 263 struct { 264 unsigned long class; 265 u32 classid; 266 }; 267 const struct tcf_proto *goto_tp; 268 269 /* used by the TC_ACT_REINSERT action */ 270 struct { 271 bool ingress; 272 struct gnet_stats_queue *qstats; 273 }; 274 }; 275 }; 276 277 struct tcf_chain; 278 279 struct tcf_proto_ops { 280 struct list_head head; 281 char kind[IFNAMSIZ]; 282 283 int (*classify)(struct sk_buff *, 284 const struct tcf_proto *, 285 struct tcf_result *); 286 int (*init)(struct tcf_proto*); 287 void (*destroy)(struct tcf_proto *tp, bool rtnl_held, 288 struct netlink_ext_ack *extack); 289 290 void* (*get)(struct tcf_proto*, u32 handle); 291 void (*put)(struct tcf_proto *tp, void *f); 292 int (*change)(struct net *net, struct sk_buff *, 293 struct tcf_proto*, unsigned long, 294 u32 handle, struct nlattr **, 295 void **, bool, bool, 296 struct netlink_ext_ack *); 297 int (*delete)(struct tcf_proto *tp, void *arg, 298 bool *last, bool rtnl_held, 299 struct netlink_ext_ack *); 300 void (*walk)(struct tcf_proto *tp, 301 struct tcf_walker *arg, bool rtnl_held); 302 int (*reoffload)(struct tcf_proto *tp, bool add, 303 tc_setup_cb_t *cb, void *cb_priv, 304 struct netlink_ext_ack *extack); 305 void (*bind_class)(void *, u32, unsigned long); 306 void * (*tmplt_create)(struct net *net, 307 struct tcf_chain *chain, 308 struct nlattr **tca, 309 struct netlink_ext_ack *extack); 310 void (*tmplt_destroy)(void *tmplt_priv); 311 312 /* rtnetlink specific */ 313 int (*dump)(struct net*, struct tcf_proto*, void *, 314 struct sk_buff *skb, struct tcmsg*, 315 bool); 316 int (*tmplt_dump)(struct sk_buff *skb, 317 struct net *net, 318 void *tmplt_priv); 319 320 struct module *owner; 321 int flags; 322 }; 323 324 enum tcf_proto_ops_flags { 325 TCF_PROTO_OPS_DOIT_UNLOCKED = 1, 326 }; 327 328 struct tcf_proto { 329 /* Fast access part */ 330 struct tcf_proto __rcu *next; 331 void __rcu *root; 332 333 /* called under RCU BH lock*/ 334 int (*classify)(struct sk_buff *, 335 const struct tcf_proto *, 336 struct tcf_result *); 337 __be16 protocol; 338 339 /* All the rest */ 340 u32 prio; 341 void *data; 342 const struct tcf_proto_ops *ops; 343 struct tcf_chain *chain; 344 /* Lock protects tcf_proto shared state and can be used by unlocked 345 * classifiers to protect their private data. 346 */ 347 spinlock_t lock; 348 bool deleting; 349 refcount_t refcnt; 350 struct rcu_head rcu; 351 }; 352 353 struct qdisc_skb_cb { 354 union { 355 struct { 356 unsigned int pkt_len; 357 u16 slave_dev_queue_mapping; 358 u16 tc_classid; 359 }; 360 struct bpf_flow_keys *flow_keys; 361 }; 362 #define QDISC_CB_PRIV_LEN 20 363 unsigned char data[QDISC_CB_PRIV_LEN]; 364 }; 365 366 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); 367 368 struct tcf_chain { 369 /* Protects filter_chain. */ 370 struct mutex filter_chain_lock; 371 struct tcf_proto __rcu *filter_chain; 372 struct list_head list; 373 struct tcf_block *block; 374 u32 index; /* chain index */ 375 unsigned int refcnt; 376 unsigned int action_refcnt; 377 bool explicitly_created; 378 bool flushing; 379 const struct tcf_proto_ops *tmplt_ops; 380 void *tmplt_priv; 381 }; 382 383 struct tcf_block { 384 /* Lock protects tcf_block and lifetime-management data of chains 385 * attached to the block (refcnt, action_refcnt, explicitly_created). 386 */ 387 struct mutex lock; 388 struct list_head chain_list; 389 u32 index; /* block index for shared blocks */ 390 refcount_t refcnt; 391 struct net *net; 392 struct Qdisc *q; 393 struct list_head cb_list; 394 struct list_head owner_list; 395 bool keep_dst; 396 unsigned int offloadcnt; /* Number of oddloaded filters */ 397 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ 398 struct { 399 struct tcf_chain *chain; 400 struct list_head filter_chain_list; 401 } chain0; 402 struct rcu_head rcu; 403 }; 404 405 #ifdef CONFIG_PROVE_LOCKING 406 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) 407 { 408 return lockdep_is_held(&chain->filter_chain_lock); 409 } 410 411 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) 412 { 413 return lockdep_is_held(&tp->lock); 414 } 415 #else 416 static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain) 417 { 418 return true; 419 } 420 421 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) 422 { 423 return true; 424 } 425 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 426 427 #define tcf_chain_dereference(p, chain) \ 428 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) 429 430 #define tcf_proto_dereference(p, tp) \ 431 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) 432 433 static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags) 434 { 435 if (*flags & TCA_CLS_FLAGS_IN_HW) 436 return; 437 *flags |= TCA_CLS_FLAGS_IN_HW; 438 block->offloadcnt++; 439 } 440 441 static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags) 442 { 443 if (!(*flags & TCA_CLS_FLAGS_IN_HW)) 444 return; 445 *flags &= ~TCA_CLS_FLAGS_IN_HW; 446 block->offloadcnt--; 447 } 448 449 static inline void 450 tc_cls_offload_cnt_update(struct tcf_block *block, u32 *cnt, 451 u32 *flags, bool add) 452 { 453 if (add) { 454 if (!*cnt) 455 tcf_block_offload_inc(block, flags); 456 (*cnt)++; 457 } else { 458 (*cnt)--; 459 if (!*cnt) 460 tcf_block_offload_dec(block, flags); 461 } 462 } 463 464 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 465 { 466 struct qdisc_skb_cb *qcb; 467 468 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); 469 BUILD_BUG_ON(sizeof(qcb->data) < sz); 470 } 471 472 static inline int qdisc_qlen(const struct Qdisc *q) 473 { 474 return q->q.qlen; 475 } 476 477 static inline u32 qdisc_qlen_sum(const struct Qdisc *q) 478 { 479 u32 qlen = q->qstats.qlen; 480 481 if (q->flags & TCQ_F_NOLOCK) 482 qlen += atomic_read(&q->q.atomic_qlen); 483 else 484 qlen += q->q.qlen; 485 486 return qlen; 487 } 488 489 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 490 { 491 return (struct qdisc_skb_cb *)skb->cb; 492 } 493 494 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 495 { 496 return &qdisc->q.lock; 497 } 498 499 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 500 { 501 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 502 503 return q; 504 } 505 506 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 507 { 508 return qdisc->dev_queue->qdisc_sleeping; 509 } 510 511 /* The qdisc root lock is a mechanism by which to top level 512 * of a qdisc tree can be locked from any qdisc node in the 513 * forest. This allows changing the configuration of some 514 * aspect of the qdisc tree while blocking out asynchronous 515 * qdisc access in the packet processing paths. 516 * 517 * It is only legal to do this when the root will not change 518 * on us. Otherwise we'll potentially lock the wrong qdisc 519 * root. This is enforced by holding the RTNL semaphore, which 520 * all users of this lock accessor must do. 521 */ 522 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) 523 { 524 struct Qdisc *root = qdisc_root(qdisc); 525 526 ASSERT_RTNL(); 527 return qdisc_lock(root); 528 } 529 530 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 531 { 532 struct Qdisc *root = qdisc_root_sleeping(qdisc); 533 534 ASSERT_RTNL(); 535 return qdisc_lock(root); 536 } 537 538 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) 539 { 540 struct Qdisc *root = qdisc_root_sleeping(qdisc); 541 542 ASSERT_RTNL(); 543 return &root->running; 544 } 545 546 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 547 { 548 return qdisc->dev_queue->dev; 549 } 550 551 static inline void sch_tree_lock(const struct Qdisc *q) 552 { 553 spin_lock_bh(qdisc_root_sleeping_lock(q)); 554 } 555 556 static inline void sch_tree_unlock(const struct Qdisc *q) 557 { 558 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 559 } 560 561 extern struct Qdisc noop_qdisc; 562 extern struct Qdisc_ops noop_qdisc_ops; 563 extern struct Qdisc_ops pfifo_fast_ops; 564 extern struct Qdisc_ops mq_qdisc_ops; 565 extern struct Qdisc_ops noqueue_qdisc_ops; 566 extern const struct Qdisc_ops *default_qdisc_ops; 567 static inline const struct Qdisc_ops * 568 get_default_qdisc_ops(const struct net_device *dev, int ntx) 569 { 570 return ntx < dev->real_num_tx_queues ? 571 default_qdisc_ops : &pfifo_fast_ops; 572 } 573 574 struct Qdisc_class_common { 575 u32 classid; 576 struct hlist_node hnode; 577 }; 578 579 struct Qdisc_class_hash { 580 struct hlist_head *hash; 581 unsigned int hashsize; 582 unsigned int hashmask; 583 unsigned int hashelems; 584 }; 585 586 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 587 { 588 id ^= id >> 8; 589 id ^= id >> 4; 590 return id & mask; 591 } 592 593 static inline struct Qdisc_class_common * 594 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 595 { 596 struct Qdisc_class_common *cl; 597 unsigned int h; 598 599 if (!id) 600 return NULL; 601 602 h = qdisc_class_hash(id, hash->hashmask); 603 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 604 if (cl->classid == id) 605 return cl; 606 } 607 return NULL; 608 } 609 610 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 611 { 612 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 613 614 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 615 } 616 617 int qdisc_class_hash_init(struct Qdisc_class_hash *); 618 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 619 struct Qdisc_class_common *); 620 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 621 struct Qdisc_class_common *); 622 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 623 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 624 625 int dev_qdisc_change_tx_queue_len(struct net_device *dev); 626 void dev_init_scheduler(struct net_device *dev); 627 void dev_shutdown(struct net_device *dev); 628 void dev_activate(struct net_device *dev); 629 void dev_deactivate(struct net_device *dev); 630 void dev_deactivate_many(struct list_head *head); 631 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 632 struct Qdisc *qdisc); 633 void qdisc_reset(struct Qdisc *qdisc); 634 void qdisc_put(struct Qdisc *qdisc); 635 void qdisc_put_unlocked(struct Qdisc *qdisc); 636 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); 637 #ifdef CONFIG_NET_SCHED 638 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 639 void *type_data); 640 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 641 struct Qdisc *new, struct Qdisc *old, 642 enum tc_setup_type type, void *type_data, 643 struct netlink_ext_ack *extack); 644 #else 645 static inline int 646 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 647 void *type_data) 648 { 649 q->flags &= ~TCQ_F_OFFLOADED; 650 return 0; 651 } 652 653 static inline void 654 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 655 struct Qdisc *new, struct Qdisc *old, 656 enum tc_setup_type type, void *type_data, 657 struct netlink_ext_ack *extack) 658 { 659 } 660 #endif 661 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 662 const struct Qdisc_ops *ops, 663 struct netlink_ext_ack *extack); 664 void qdisc_free(struct Qdisc *qdisc); 665 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 666 const struct Qdisc_ops *ops, u32 parentid, 667 struct netlink_ext_ack *extack); 668 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 669 const struct qdisc_size_table *stab); 670 int skb_do_redirect(struct sk_buff *); 671 672 static inline void skb_reset_tc(struct sk_buff *skb) 673 { 674 #ifdef CONFIG_NET_CLS_ACT 675 skb->tc_redirected = 0; 676 #endif 677 } 678 679 static inline bool skb_is_tc_redirected(const struct sk_buff *skb) 680 { 681 #ifdef CONFIG_NET_CLS_ACT 682 return skb->tc_redirected; 683 #else 684 return false; 685 #endif 686 } 687 688 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 689 { 690 #ifdef CONFIG_NET_CLS_ACT 691 return skb->tc_at_ingress; 692 #else 693 return false; 694 #endif 695 } 696 697 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 698 { 699 #ifdef CONFIG_NET_CLS_ACT 700 if (skb->tc_skip_classify) { 701 skb->tc_skip_classify = 0; 702 return true; 703 } 704 #endif 705 return false; 706 } 707 708 /* Reset all TX qdiscs greater than index of a device. */ 709 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 710 { 711 struct Qdisc *qdisc; 712 713 for (; i < dev->num_tx_queues; i++) { 714 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 715 if (qdisc) { 716 spin_lock_bh(qdisc_lock(qdisc)); 717 qdisc_reset(qdisc); 718 spin_unlock_bh(qdisc_lock(qdisc)); 719 } 720 } 721 } 722 723 static inline void qdisc_reset_all_tx(struct net_device *dev) 724 { 725 qdisc_reset_all_tx_gt(dev, 0); 726 } 727 728 /* Are all TX queues of the device empty? */ 729 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 730 { 731 unsigned int i; 732 733 rcu_read_lock(); 734 for (i = 0; i < dev->num_tx_queues; i++) { 735 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 736 const struct Qdisc *q = rcu_dereference(txq->qdisc); 737 738 if (q->q.qlen) { 739 rcu_read_unlock(); 740 return false; 741 } 742 } 743 rcu_read_unlock(); 744 return true; 745 } 746 747 /* Are any of the TX qdiscs changing? */ 748 static inline bool qdisc_tx_changing(const struct net_device *dev) 749 { 750 unsigned int i; 751 752 for (i = 0; i < dev->num_tx_queues; i++) { 753 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 754 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) 755 return true; 756 } 757 return false; 758 } 759 760 /* Is the device using the noop qdisc on all queues? */ 761 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 762 { 763 unsigned int i; 764 765 for (i = 0; i < dev->num_tx_queues; i++) { 766 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 767 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 768 return false; 769 } 770 return true; 771 } 772 773 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 774 { 775 return qdisc_skb_cb(skb)->pkt_len; 776 } 777 778 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 779 enum net_xmit_qdisc_t { 780 __NET_XMIT_STOLEN = 0x00010000, 781 __NET_XMIT_BYPASS = 0x00020000, 782 }; 783 784 #ifdef CONFIG_NET_CLS_ACT 785 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 786 #else 787 #define net_xmit_drop_count(e) (1) 788 #endif 789 790 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 791 const struct Qdisc *sch) 792 { 793 #ifdef CONFIG_NET_SCHED 794 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 795 796 if (stab) 797 __qdisc_calculate_pkt_len(skb, stab); 798 #endif 799 } 800 801 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 802 struct sk_buff **to_free) 803 { 804 qdisc_calculate_pkt_len(skb, sch); 805 return sch->enqueue(skb, sch, to_free); 806 } 807 808 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) 809 { 810 return q->flags & TCQ_F_CPUSTATS; 811 } 812 813 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, 814 __u64 bytes, __u32 packets) 815 { 816 bstats->bytes += bytes; 817 bstats->packets += packets; 818 } 819 820 static inline void bstats_update(struct gnet_stats_basic_packed *bstats, 821 const struct sk_buff *skb) 822 { 823 _bstats_update(bstats, 824 qdisc_pkt_len(skb), 825 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); 826 } 827 828 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, 829 __u64 bytes, __u32 packets) 830 { 831 u64_stats_update_begin(&bstats->syncp); 832 _bstats_update(&bstats->bstats, bytes, packets); 833 u64_stats_update_end(&bstats->syncp); 834 } 835 836 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, 837 const struct sk_buff *skb) 838 { 839 u64_stats_update_begin(&bstats->syncp); 840 bstats_update(&bstats->bstats, skb); 841 u64_stats_update_end(&bstats->syncp); 842 } 843 844 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 845 const struct sk_buff *skb) 846 { 847 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); 848 } 849 850 static inline void qdisc_bstats_update(struct Qdisc *sch, 851 const struct sk_buff *skb) 852 { 853 bstats_update(&sch->bstats, skb); 854 } 855 856 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 857 const struct sk_buff *skb) 858 { 859 sch->qstats.backlog -= qdisc_pkt_len(skb); 860 } 861 862 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 863 const struct sk_buff *skb) 864 { 865 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 866 } 867 868 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 869 const struct sk_buff *skb) 870 { 871 sch->qstats.backlog += qdisc_pkt_len(skb); 872 } 873 874 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 875 const struct sk_buff *skb) 876 { 877 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 878 } 879 880 static inline void qdisc_qstats_atomic_qlen_inc(struct Qdisc *sch) 881 { 882 atomic_inc(&sch->q.atomic_qlen); 883 } 884 885 static inline void qdisc_qstats_atomic_qlen_dec(struct Qdisc *sch) 886 { 887 atomic_dec(&sch->q.atomic_qlen); 888 } 889 890 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 891 { 892 this_cpu_inc(sch->cpu_qstats->requeues); 893 } 894 895 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 896 { 897 sch->qstats.drops += count; 898 } 899 900 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 901 { 902 qstats->drops++; 903 } 904 905 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 906 { 907 qstats->overlimits++; 908 } 909 910 static inline void qdisc_qstats_drop(struct Qdisc *sch) 911 { 912 qstats_drop_inc(&sch->qstats); 913 } 914 915 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 916 { 917 this_cpu_inc(sch->cpu_qstats->drops); 918 } 919 920 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 921 { 922 sch->qstats.overlimits++; 923 } 924 925 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) 926 { 927 qh->head = NULL; 928 qh->tail = NULL; 929 qh->qlen = 0; 930 } 931 932 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 933 struct qdisc_skb_head *qh) 934 { 935 struct sk_buff *last = qh->tail; 936 937 if (last) { 938 skb->next = NULL; 939 last->next = skb; 940 qh->tail = skb; 941 } else { 942 qh->tail = skb; 943 qh->head = skb; 944 } 945 qh->qlen++; 946 } 947 948 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 949 { 950 __qdisc_enqueue_tail(skb, &sch->q); 951 qdisc_qstats_backlog_inc(sch, skb); 952 return NET_XMIT_SUCCESS; 953 } 954 955 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 956 struct qdisc_skb_head *qh) 957 { 958 skb->next = qh->head; 959 960 if (!qh->head) 961 qh->tail = skb; 962 qh->head = skb; 963 qh->qlen++; 964 } 965 966 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 967 { 968 struct sk_buff *skb = qh->head; 969 970 if (likely(skb != NULL)) { 971 qh->head = skb->next; 972 qh->qlen--; 973 if (qh->head == NULL) 974 qh->tail = NULL; 975 skb->next = NULL; 976 } 977 978 return skb; 979 } 980 981 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 982 { 983 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 984 985 if (likely(skb != NULL)) { 986 qdisc_qstats_backlog_dec(sch, skb); 987 qdisc_bstats_update(sch, skb); 988 } 989 990 return skb; 991 } 992 993 /* Instead of calling kfree_skb() while root qdisc lock is held, 994 * queue the skb for future freeing at end of __dev_xmit_skb() 995 */ 996 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 997 { 998 skb->next = *to_free; 999 *to_free = skb; 1000 } 1001 1002 static inline void __qdisc_drop_all(struct sk_buff *skb, 1003 struct sk_buff **to_free) 1004 { 1005 if (skb->prev) 1006 skb->prev->next = *to_free; 1007 else 1008 skb->next = *to_free; 1009 *to_free = skb; 1010 } 1011 1012 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1013 struct qdisc_skb_head *qh, 1014 struct sk_buff **to_free) 1015 { 1016 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1017 1018 if (likely(skb != NULL)) { 1019 unsigned int len = qdisc_pkt_len(skb); 1020 1021 qdisc_qstats_backlog_dec(sch, skb); 1022 __qdisc_drop(skb, to_free); 1023 return len; 1024 } 1025 1026 return 0; 1027 } 1028 1029 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, 1030 struct sk_buff **to_free) 1031 { 1032 return __qdisc_queue_drop_head(sch, &sch->q, to_free); 1033 } 1034 1035 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1036 { 1037 const struct qdisc_skb_head *qh = &sch->q; 1038 1039 return qh->head; 1040 } 1041 1042 /* generic pseudo peek method for non-work-conserving qdisc */ 1043 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1044 { 1045 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1046 1047 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1048 if (!skb) { 1049 skb = sch->dequeue(sch); 1050 1051 if (skb) { 1052 __skb_queue_head(&sch->gso_skb, skb); 1053 /* it's still part of the queue */ 1054 qdisc_qstats_backlog_inc(sch, skb); 1055 sch->q.qlen++; 1056 } 1057 } 1058 1059 return skb; 1060 } 1061 1062 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1063 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1064 { 1065 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1066 1067 if (skb) { 1068 skb = __skb_dequeue(&sch->gso_skb); 1069 qdisc_qstats_backlog_dec(sch, skb); 1070 sch->q.qlen--; 1071 } else { 1072 skb = sch->dequeue(sch); 1073 } 1074 1075 return skb; 1076 } 1077 1078 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1079 { 1080 /* 1081 * We do not know the backlog in bytes of this list, it 1082 * is up to the caller to correct it 1083 */ 1084 ASSERT_RTNL(); 1085 if (qh->qlen) { 1086 rtnl_kfree_skbs(qh->head, qh->tail); 1087 1088 qh->head = NULL; 1089 qh->tail = NULL; 1090 qh->qlen = 0; 1091 } 1092 } 1093 1094 static inline void qdisc_reset_queue(struct Qdisc *sch) 1095 { 1096 __qdisc_reset_queue(&sch->q); 1097 sch->qstats.backlog = 0; 1098 } 1099 1100 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1101 struct Qdisc **pold) 1102 { 1103 struct Qdisc *old; 1104 1105 sch_tree_lock(sch); 1106 old = *pold; 1107 *pold = new; 1108 if (old != NULL) { 1109 unsigned int qlen = old->q.qlen; 1110 unsigned int backlog = old->qstats.backlog; 1111 1112 qdisc_reset(old); 1113 qdisc_tree_reduce_backlog(old, qlen, backlog); 1114 } 1115 sch_tree_unlock(sch); 1116 1117 return old; 1118 } 1119 1120 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1121 { 1122 rtnl_kfree_skbs(skb, skb); 1123 qdisc_qstats_drop(sch); 1124 } 1125 1126 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1127 struct sk_buff **to_free) 1128 { 1129 __qdisc_drop(skb, to_free); 1130 qdisc_qstats_cpu_drop(sch); 1131 1132 return NET_XMIT_DROP; 1133 } 1134 1135 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1136 struct sk_buff **to_free) 1137 { 1138 __qdisc_drop(skb, to_free); 1139 qdisc_qstats_drop(sch); 1140 1141 return NET_XMIT_DROP; 1142 } 1143 1144 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1145 struct sk_buff **to_free) 1146 { 1147 __qdisc_drop_all(skb, to_free); 1148 qdisc_qstats_drop(sch); 1149 1150 return NET_XMIT_DROP; 1151 } 1152 1153 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how 1154 long it will take to send a packet given its size. 1155 */ 1156 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) 1157 { 1158 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; 1159 if (slot < 0) 1160 slot = 0; 1161 slot >>= rtab->rate.cell_log; 1162 if (slot > 255) 1163 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; 1164 return rtab->data[slot]; 1165 } 1166 1167 struct psched_ratecfg { 1168 u64 rate_bytes_ps; /* bytes per second */ 1169 u32 mult; 1170 u16 overhead; 1171 u8 linklayer; 1172 u8 shift; 1173 }; 1174 1175 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1176 unsigned int len) 1177 { 1178 len += r->overhead; 1179 1180 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1181 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1182 1183 return ((u64)len * r->mult) >> r->shift; 1184 } 1185 1186 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1187 const struct tc_ratespec *conf, 1188 u64 rate64); 1189 1190 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1191 const struct psched_ratecfg *r) 1192 { 1193 memset(res, 0, sizeof(*res)); 1194 1195 /* legacy struct tc_ratespec has a 32bit @rate field 1196 * Qdisc using 64bit rate should add new attributes 1197 * in order to maintain compatibility. 1198 */ 1199 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1200 1201 res->overhead = r->overhead; 1202 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 1203 } 1204 1205 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 1206 * The fast path only needs to access filter list and to update stats 1207 */ 1208 struct mini_Qdisc { 1209 struct tcf_proto *filter_list; 1210 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 1211 struct gnet_stats_queue __percpu *cpu_qstats; 1212 struct rcu_head rcu; 1213 }; 1214 1215 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1216 const struct sk_buff *skb) 1217 { 1218 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb); 1219 } 1220 1221 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 1222 { 1223 this_cpu_inc(miniq->cpu_qstats->drops); 1224 } 1225 1226 struct mini_Qdisc_pair { 1227 struct mini_Qdisc miniq1; 1228 struct mini_Qdisc miniq2; 1229 struct mini_Qdisc __rcu **p_miniq; 1230 }; 1231 1232 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1233 struct tcf_proto *tp_head); 1234 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1235 struct mini_Qdisc __rcu **p_miniq); 1236 1237 static inline void skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res) 1238 { 1239 struct gnet_stats_queue *stats = res->qstats; 1240 int ret; 1241 1242 if (res->ingress) 1243 ret = netif_receive_skb(skb); 1244 else 1245 ret = dev_queue_xmit(skb); 1246 if (ret && stats) 1247 qstats_overlimit_inc(res->qstats); 1248 } 1249 1250 #endif 1251