1 #ifndef __NET_SCHED_GENERIC_H 2 #define __NET_SCHED_GENERIC_H 3 4 #include <linux/netdevice.h> 5 #include <linux/types.h> 6 #include <linux/rcupdate.h> 7 #include <linux/module.h> 8 #include <linux/pkt_sched.h> 9 #include <linux/pkt_cls.h> 10 #include <net/gen_stats.h> 11 #include <net/rtnetlink.h> 12 13 struct Qdisc_ops; 14 struct qdisc_walker; 15 struct tcf_walker; 16 struct module; 17 18 struct qdisc_rate_table 19 { 20 struct tc_ratespec rate; 21 u32 data[256]; 22 struct qdisc_rate_table *next; 23 int refcnt; 24 }; 25 26 enum qdisc_state_t 27 { 28 __QDISC_STATE_RUNNING, 29 __QDISC_STATE_SCHED, 30 __QDISC_STATE_DEACTIVATED, 31 }; 32 33 struct qdisc_size_table { 34 struct list_head list; 35 struct tc_sizespec szopts; 36 int refcnt; 37 u16 data[]; 38 }; 39 40 struct Qdisc 41 { 42 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev); 43 struct sk_buff * (*dequeue)(struct Qdisc *dev); 44 unsigned flags; 45 #define TCQ_F_BUILTIN 1 46 #define TCQ_F_THROTTLED 2 47 #define TCQ_F_INGRESS 4 48 int padded; 49 struct Qdisc_ops *ops; 50 struct qdisc_size_table *stab; 51 u32 handle; 52 u32 parent; 53 atomic_t refcnt; 54 unsigned long state; 55 struct sk_buff *gso_skb; 56 struct sk_buff_head requeue; 57 struct sk_buff_head q; 58 struct netdev_queue *dev_queue; 59 struct Qdisc *next_sched; 60 struct list_head list; 61 62 struct gnet_stats_basic bstats; 63 struct gnet_stats_queue qstats; 64 struct gnet_stats_rate_est rate_est; 65 int (*reshape_fail)(struct sk_buff *skb, 66 struct Qdisc *q); 67 68 void *u32_node; 69 70 /* This field is deprecated, but it is still used by CBQ 71 * and it will live until better solution will be invented. 72 */ 73 struct Qdisc *__parent; 74 }; 75 76 struct Qdisc_class_ops 77 { 78 /* Child qdisc manipulation */ 79 int (*graft)(struct Qdisc *, unsigned long cl, 80 struct Qdisc *, struct Qdisc **); 81 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); 82 void (*qlen_notify)(struct Qdisc *, unsigned long); 83 84 /* Class manipulation routines */ 85 unsigned long (*get)(struct Qdisc *, u32 classid); 86 void (*put)(struct Qdisc *, unsigned long); 87 int (*change)(struct Qdisc *, u32, u32, 88 struct nlattr **, unsigned long *); 89 int (*delete)(struct Qdisc *, unsigned long); 90 void (*walk)(struct Qdisc *, struct qdisc_walker * arg); 91 92 /* Filter manipulation */ 93 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long); 94 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, 95 u32 classid); 96 void (*unbind_tcf)(struct Qdisc *, unsigned long); 97 98 /* rtnetlink specific */ 99 int (*dump)(struct Qdisc *, unsigned long, 100 struct sk_buff *skb, struct tcmsg*); 101 int (*dump_stats)(struct Qdisc *, unsigned long, 102 struct gnet_dump *); 103 }; 104 105 struct Qdisc_ops 106 { 107 struct Qdisc_ops *next; 108 const struct Qdisc_class_ops *cl_ops; 109 char id[IFNAMSIZ]; 110 int priv_size; 111 112 int (*enqueue)(struct sk_buff *, struct Qdisc *); 113 struct sk_buff * (*dequeue)(struct Qdisc *); 114 int (*requeue)(struct sk_buff *, struct Qdisc *); 115 unsigned int (*drop)(struct Qdisc *); 116 117 int (*init)(struct Qdisc *, struct nlattr *arg); 118 void (*reset)(struct Qdisc *); 119 void (*destroy)(struct Qdisc *); 120 int (*change)(struct Qdisc *, struct nlattr *arg); 121 122 int (*dump)(struct Qdisc *, struct sk_buff *); 123 int (*dump_stats)(struct Qdisc *, struct gnet_dump *); 124 125 struct module *owner; 126 }; 127 128 129 struct tcf_result 130 { 131 unsigned long class; 132 u32 classid; 133 }; 134 135 struct tcf_proto_ops 136 { 137 struct tcf_proto_ops *next; 138 char kind[IFNAMSIZ]; 139 140 int (*classify)(struct sk_buff*, struct tcf_proto*, 141 struct tcf_result *); 142 int (*init)(struct tcf_proto*); 143 void (*destroy)(struct tcf_proto*); 144 145 unsigned long (*get)(struct tcf_proto*, u32 handle); 146 void (*put)(struct tcf_proto*, unsigned long); 147 int (*change)(struct tcf_proto*, unsigned long, 148 u32 handle, struct nlattr **, 149 unsigned long *); 150 int (*delete)(struct tcf_proto*, unsigned long); 151 void (*walk)(struct tcf_proto*, struct tcf_walker *arg); 152 153 /* rtnetlink specific */ 154 int (*dump)(struct tcf_proto*, unsigned long, 155 struct sk_buff *skb, struct tcmsg*); 156 157 struct module *owner; 158 }; 159 160 struct tcf_proto 161 { 162 /* Fast access part */ 163 struct tcf_proto *next; 164 void *root; 165 int (*classify)(struct sk_buff*, struct tcf_proto*, 166 struct tcf_result *); 167 __be16 protocol; 168 169 /* All the rest */ 170 u32 prio; 171 u32 classid; 172 struct Qdisc *q; 173 void *data; 174 struct tcf_proto_ops *ops; 175 }; 176 177 struct qdisc_skb_cb { 178 unsigned int pkt_len; 179 char data[]; 180 }; 181 182 static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb) 183 { 184 return (struct qdisc_skb_cb *)skb->cb; 185 } 186 187 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 188 { 189 return &qdisc->q.lock; 190 } 191 192 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc) 193 { 194 return qdisc->dev_queue->qdisc; 195 } 196 197 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc) 198 { 199 return qdisc->dev_queue->qdisc_sleeping; 200 } 201 202 /* The qdisc root lock is a mechanism by which to top level 203 * of a qdisc tree can be locked from any qdisc node in the 204 * forest. This allows changing the configuration of some 205 * aspect of the qdisc tree while blocking out asynchronous 206 * qdisc access in the packet processing paths. 207 * 208 * It is only legal to do this when the root will not change 209 * on us. Otherwise we'll potentially lock the wrong qdisc 210 * root. This is enforced by holding the RTNL semaphore, which 211 * all users of this lock accessor must do. 212 */ 213 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc) 214 { 215 struct Qdisc *root = qdisc_root(qdisc); 216 217 ASSERT_RTNL(); 218 return qdisc_lock(root); 219 } 220 221 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc) 222 { 223 struct Qdisc *root = qdisc_root_sleeping(qdisc); 224 225 ASSERT_RTNL(); 226 return qdisc_lock(root); 227 } 228 229 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc) 230 { 231 return qdisc->dev_queue->dev; 232 } 233 234 static inline void sch_tree_lock(struct Qdisc *q) 235 { 236 spin_lock_bh(qdisc_root_sleeping_lock(q)); 237 } 238 239 static inline void sch_tree_unlock(struct Qdisc *q) 240 { 241 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 242 } 243 244 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) 245 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) 246 247 extern struct Qdisc noop_qdisc; 248 extern struct Qdisc_ops noop_qdisc_ops; 249 250 struct Qdisc_class_common 251 { 252 u32 classid; 253 struct hlist_node hnode; 254 }; 255 256 struct Qdisc_class_hash 257 { 258 struct hlist_head *hash; 259 unsigned int hashsize; 260 unsigned int hashmask; 261 unsigned int hashelems; 262 }; 263 264 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 265 { 266 id ^= id >> 8; 267 id ^= id >> 4; 268 return id & mask; 269 } 270 271 static inline struct Qdisc_class_common * 272 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id) 273 { 274 struct Qdisc_class_common *cl; 275 struct hlist_node *n; 276 unsigned int h; 277 278 h = qdisc_class_hash(id, hash->hashmask); 279 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) { 280 if (cl->classid == id) 281 return cl; 282 } 283 return NULL; 284 } 285 286 extern int qdisc_class_hash_init(struct Qdisc_class_hash *); 287 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *); 288 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *); 289 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 290 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 291 292 extern void dev_init_scheduler(struct net_device *dev); 293 extern void dev_shutdown(struct net_device *dev); 294 extern void dev_activate(struct net_device *dev); 295 extern void dev_deactivate(struct net_device *dev); 296 extern void qdisc_reset(struct Qdisc *qdisc); 297 extern void qdisc_destroy(struct Qdisc *qdisc); 298 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n); 299 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 300 struct Qdisc_ops *ops); 301 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev, 302 struct netdev_queue *dev_queue, 303 struct Qdisc_ops *ops, u32 parentid); 304 extern void qdisc_calculate_pkt_len(struct sk_buff *skb, 305 struct qdisc_size_table *stab); 306 extern void tcf_destroy(struct tcf_proto *tp); 307 extern void tcf_destroy_chain(struct tcf_proto **fl); 308 309 /* Reset all TX qdiscs of a device. */ 310 static inline void qdisc_reset_all_tx(struct net_device *dev) 311 { 312 unsigned int i; 313 for (i = 0; i < dev->num_tx_queues; i++) 314 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc); 315 } 316 317 /* Are all TX queues of the device empty? */ 318 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 319 { 320 unsigned int i; 321 for (i = 0; i < dev->num_tx_queues; i++) { 322 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 323 const struct Qdisc *q = txq->qdisc; 324 325 if (q->q.qlen) 326 return false; 327 } 328 return true; 329 } 330 331 /* Are any of the TX qdiscs changing? */ 332 static inline bool qdisc_tx_changing(struct net_device *dev) 333 { 334 unsigned int i; 335 for (i = 0; i < dev->num_tx_queues; i++) { 336 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 337 if (txq->qdisc != txq->qdisc_sleeping) 338 return true; 339 } 340 return false; 341 } 342 343 /* Is the device using the noop qdisc on all queues? */ 344 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 345 { 346 unsigned int i; 347 for (i = 0; i < dev->num_tx_queues; i++) { 348 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 349 if (txq->qdisc != &noop_qdisc) 350 return false; 351 } 352 return true; 353 } 354 355 static inline unsigned int qdisc_pkt_len(struct sk_buff *skb) 356 { 357 return qdisc_skb_cb(skb)->pkt_len; 358 } 359 360 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 361 enum net_xmit_qdisc_t { 362 __NET_XMIT_STOLEN = 0x00010000, 363 __NET_XMIT_BYPASS = 0x00020000, 364 }; 365 366 #ifdef CONFIG_NET_CLS_ACT 367 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 368 #else 369 #define net_xmit_drop_count(e) (1) 370 #endif 371 372 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) 373 { 374 #ifdef CONFIG_NET_SCHED 375 if (sch->stab) 376 qdisc_calculate_pkt_len(skb, sch->stab); 377 #endif 378 return sch->enqueue(skb, sch); 379 } 380 381 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch) 382 { 383 qdisc_skb_cb(skb)->pkt_len = skb->len; 384 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK; 385 } 386 387 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, 388 struct sk_buff_head *list) 389 { 390 __skb_queue_tail(list, skb); 391 sch->qstats.backlog += qdisc_pkt_len(skb); 392 sch->bstats.bytes += qdisc_pkt_len(skb); 393 sch->bstats.packets++; 394 395 return NET_XMIT_SUCCESS; 396 } 397 398 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 399 { 400 return __qdisc_enqueue_tail(skb, sch, &sch->q); 401 } 402 403 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, 404 struct sk_buff_head *list) 405 { 406 struct sk_buff *skb = __skb_dequeue(list); 407 408 if (likely(skb != NULL)) 409 sch->qstats.backlog -= qdisc_pkt_len(skb); 410 411 return skb; 412 } 413 414 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 415 { 416 return __qdisc_dequeue_head(sch, &sch->q); 417 } 418 419 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, 420 struct sk_buff_head *list) 421 { 422 struct sk_buff *skb = __skb_dequeue_tail(list); 423 424 if (likely(skb != NULL)) 425 sch->qstats.backlog -= qdisc_pkt_len(skb); 426 427 return skb; 428 } 429 430 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) 431 { 432 return __qdisc_dequeue_tail(sch, &sch->q); 433 } 434 435 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch, 436 struct sk_buff_head *list) 437 { 438 __skb_queue_head(list, skb); 439 sch->qstats.backlog += qdisc_pkt_len(skb); 440 sch->qstats.requeues++; 441 442 return NET_XMIT_SUCCESS; 443 } 444 445 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch) 446 { 447 return __qdisc_requeue(skb, sch, &sch->q); 448 } 449 450 static inline void __qdisc_reset_queue(struct Qdisc *sch, 451 struct sk_buff_head *list) 452 { 453 /* 454 * We do not know the backlog in bytes of this list, it 455 * is up to the caller to correct it 456 */ 457 __skb_queue_purge(list); 458 } 459 460 static inline void qdisc_reset_queue(struct Qdisc *sch) 461 { 462 __qdisc_reset_queue(sch, &sch->q); 463 sch->qstats.backlog = 0; 464 } 465 466 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, 467 struct sk_buff_head *list) 468 { 469 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); 470 471 if (likely(skb != NULL)) { 472 unsigned int len = qdisc_pkt_len(skb); 473 kfree_skb(skb); 474 return len; 475 } 476 477 return 0; 478 } 479 480 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) 481 { 482 return __qdisc_queue_drop(sch, &sch->q); 483 } 484 485 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 486 { 487 kfree_skb(skb); 488 sch->qstats.drops++; 489 490 return NET_XMIT_DROP; 491 } 492 493 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) 494 { 495 sch->qstats.drops++; 496 497 #ifdef CONFIG_NET_CLS_ACT 498 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) 499 goto drop; 500 501 return NET_XMIT_SUCCESS; 502 503 drop: 504 #endif 505 kfree_skb(skb); 506 return NET_XMIT_DROP; 507 } 508 509 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how 510 long it will take to send a packet given its size. 511 */ 512 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) 513 { 514 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; 515 if (slot < 0) 516 slot = 0; 517 slot >>= rtab->rate.cell_log; 518 if (slot > 255) 519 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]); 520 return rtab->data[slot]; 521 } 522 523 #ifdef CONFIG_NET_CLS_ACT 524 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask) 525 { 526 struct sk_buff *n = skb_clone(skb, gfp_mask); 527 528 if (n) { 529 n->tc_verd = SET_TC_VERD(n->tc_verd, 0); 530 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd); 531 n->tc_verd = CLR_TC_MUNGED(n->tc_verd); 532 } 533 return n; 534 } 535 #endif 536 537 #endif 538