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