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