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