1 #ifndef __NET_SCHED_GENERIC_H
2 #define __NET_SCHED_GENERIC_H
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>
18 struct qdisc_rate_table
20 struct tc_ratespec rate;
22 struct qdisc_rate_table *next;
28 __QDISC_STATE_RUNNING,
30 __QDISC_STATE_DEACTIVATED,
33 struct qdisc_size_table {
34 struct list_head list;
35 struct tc_sizespec szopts;
42 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
43 struct sk_buff * (*dequeue)(struct Qdisc *dev);
45 #define TCQ_F_BUILTIN 1
46 #define TCQ_F_THROTTLED 2
47 #define TCQ_F_INGRESS 4
48 #define TCQ_F_CAN_BYPASS 8
49 #define TCQ_F_WARN_NONWC (1 << 16)
51 struct Qdisc_ops *ops;
52 struct qdisc_size_table *stab;
53 struct list_head list;
57 struct gnet_stats_rate_est rate_est;
58 int (*reshape_fail)(struct sk_buff *skb,
63 /* This field is deprecated, but it is still used by CBQ
64 * and it will live until better solution will be invented.
66 struct Qdisc *__parent;
67 struct netdev_queue *dev_queue;
68 struct Qdisc *next_sched;
70 struct sk_buff *gso_skb;
72 * For performance sake on SMP, we put highly modified fields at the end
75 struct sk_buff_head q;
76 struct gnet_stats_basic_packed bstats;
77 struct gnet_stats_queue qstats;
80 struct Qdisc_class_ops
82 /* Child qdisc manipulation */
83 int (*graft)(struct Qdisc *, unsigned long cl,
84 struct Qdisc *, struct Qdisc **);
85 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
86 void (*qlen_notify)(struct Qdisc *, unsigned long);
88 /* Class manipulation routines */
89 unsigned long (*get)(struct Qdisc *, u32 classid);
90 void (*put)(struct Qdisc *, unsigned long);
91 int (*change)(struct Qdisc *, u32, u32,
92 struct nlattr **, unsigned long *);
93 int (*delete)(struct Qdisc *, unsigned long);
94 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
96 /* Filter manipulation */
97 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
98 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
100 void (*unbind_tcf)(struct Qdisc *, unsigned long);
102 /* rtnetlink specific */
103 int (*dump)(struct Qdisc *, unsigned long,
104 struct sk_buff *skb, struct tcmsg*);
105 int (*dump_stats)(struct Qdisc *, unsigned long,
111 struct Qdisc_ops *next;
112 const struct Qdisc_class_ops *cl_ops;
116 int (*enqueue)(struct sk_buff *, struct Qdisc *);
117 struct sk_buff * (*dequeue)(struct Qdisc *);
118 struct sk_buff * (*peek)(struct Qdisc *);
119 unsigned int (*drop)(struct Qdisc *);
121 int (*init)(struct Qdisc *, struct nlattr *arg);
122 void (*reset)(struct Qdisc *);
123 void (*destroy)(struct Qdisc *);
124 int (*change)(struct Qdisc *, struct nlattr *arg);
126 int (*dump)(struct Qdisc *, struct sk_buff *);
127 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
129 struct module *owner;
141 struct tcf_proto_ops *next;
144 int (*classify)(struct sk_buff*, struct tcf_proto*,
145 struct tcf_result *);
146 int (*init)(struct tcf_proto*);
147 void (*destroy)(struct tcf_proto*);
149 unsigned long (*get)(struct tcf_proto*, u32 handle);
150 void (*put)(struct tcf_proto*, unsigned long);
151 int (*change)(struct tcf_proto*, unsigned long,
152 u32 handle, struct nlattr **,
154 int (*delete)(struct tcf_proto*, unsigned long);
155 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
157 /* rtnetlink specific */
158 int (*dump)(struct tcf_proto*, unsigned long,
159 struct sk_buff *skb, struct tcmsg*);
161 struct module *owner;
166 /* Fast access part */
167 struct tcf_proto *next;
169 int (*classify)(struct sk_buff*, struct tcf_proto*,
170 struct tcf_result *);
178 struct tcf_proto_ops *ops;
181 struct qdisc_skb_cb {
182 unsigned int pkt_len;
186 static inline int qdisc_qlen(struct Qdisc *q)
191 static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
193 return (struct qdisc_skb_cb *)skb->cb;
196 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
198 return &qdisc->q.lock;
201 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
203 return qdisc->dev_queue->qdisc;
206 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
208 return qdisc->dev_queue->qdisc_sleeping;
211 /* The qdisc root lock is a mechanism by which to top level
212 * of a qdisc tree can be locked from any qdisc node in the
213 * forest. This allows changing the configuration of some
214 * aspect of the qdisc tree while blocking out asynchronous
215 * qdisc access in the packet processing paths.
217 * It is only legal to do this when the root will not change
218 * on us. Otherwise we'll potentially lock the wrong qdisc
219 * root. This is enforced by holding the RTNL semaphore, which
220 * all users of this lock accessor must do.
222 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
224 struct Qdisc *root = qdisc_root(qdisc);
227 return qdisc_lock(root);
230 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
232 struct Qdisc *root = qdisc_root_sleeping(qdisc);
235 return qdisc_lock(root);
238 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
240 return qdisc->dev_queue->dev;
243 static inline void sch_tree_lock(struct Qdisc *q)
245 spin_lock_bh(qdisc_root_sleeping_lock(q));
248 static inline void sch_tree_unlock(struct Qdisc *q)
250 spin_unlock_bh(qdisc_root_sleeping_lock(q));
253 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
254 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
256 extern struct Qdisc noop_qdisc;
257 extern struct Qdisc_ops noop_qdisc_ops;
259 struct Qdisc_class_common
262 struct hlist_node hnode;
265 struct Qdisc_class_hash
267 struct hlist_head *hash;
268 unsigned int hashsize;
269 unsigned int hashmask;
270 unsigned int hashelems;
273 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
280 static inline struct Qdisc_class_common *
281 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
283 struct Qdisc_class_common *cl;
284 struct hlist_node *n;
287 h = qdisc_class_hash(id, hash->hashmask);
288 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
289 if (cl->classid == id)
295 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
296 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
297 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
298 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
299 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
301 extern void dev_init_scheduler(struct net_device *dev);
302 extern void dev_shutdown(struct net_device *dev);
303 extern void dev_activate(struct net_device *dev);
304 extern void dev_deactivate(struct net_device *dev);
305 extern void qdisc_reset(struct Qdisc *qdisc);
306 extern void qdisc_destroy(struct Qdisc *qdisc);
307 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
308 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
309 struct Qdisc_ops *ops);
310 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
311 struct netdev_queue *dev_queue,
312 struct Qdisc_ops *ops, u32 parentid);
313 extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
314 struct qdisc_size_table *stab);
315 extern void tcf_destroy(struct tcf_proto *tp);
316 extern void tcf_destroy_chain(struct tcf_proto **fl);
318 /* Reset all TX qdiscs of a device. */
319 static inline void qdisc_reset_all_tx(struct net_device *dev)
322 for (i = 0; i < dev->num_tx_queues; i++)
323 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
326 /* Are all TX queues of the device empty? */
327 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
330 for (i = 0; i < dev->num_tx_queues; i++) {
331 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
332 const struct Qdisc *q = txq->qdisc;
340 /* Are any of the TX qdiscs changing? */
341 static inline bool qdisc_tx_changing(struct net_device *dev)
344 for (i = 0; i < dev->num_tx_queues; i++) {
345 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
346 if (txq->qdisc != txq->qdisc_sleeping)
352 /* Is the device using the noop qdisc on all queues? */
353 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
356 for (i = 0; i < dev->num_tx_queues; i++) {
357 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
358 if (txq->qdisc != &noop_qdisc)
364 static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
366 return qdisc_skb_cb(skb)->pkt_len;
369 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
370 enum net_xmit_qdisc_t {
371 __NET_XMIT_STOLEN = 0x00010000,
372 __NET_XMIT_BYPASS = 0x00020000,
375 #ifdef CONFIG_NET_CLS_ACT
376 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
378 #define net_xmit_drop_count(e) (1)
381 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
383 #ifdef CONFIG_NET_SCHED
385 qdisc_calculate_pkt_len(skb, sch->stab);
387 return sch->enqueue(skb, sch);
390 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
392 qdisc_skb_cb(skb)->pkt_len = skb->len;
393 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
396 static inline void __qdisc_update_bstats(struct Qdisc *sch, unsigned int len)
398 sch->bstats.bytes += len;
399 sch->bstats.packets++;
402 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
403 struct sk_buff_head *list)
405 __skb_queue_tail(list, skb);
406 sch->qstats.backlog += qdisc_pkt_len(skb);
407 __qdisc_update_bstats(sch, qdisc_pkt_len(skb));
409 return NET_XMIT_SUCCESS;
412 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
414 return __qdisc_enqueue_tail(skb, sch, &sch->q);
417 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
418 struct sk_buff_head *list)
420 struct sk_buff *skb = __skb_dequeue(list);
422 if (likely(skb != NULL))
423 sch->qstats.backlog -= qdisc_pkt_len(skb);
428 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
430 return __qdisc_dequeue_head(sch, &sch->q);
433 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
434 struct sk_buff_head *list)
436 struct sk_buff *skb = __skb_dequeue_tail(list);
438 if (likely(skb != NULL))
439 sch->qstats.backlog -= qdisc_pkt_len(skb);
444 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
446 return __qdisc_dequeue_tail(sch, &sch->q);
449 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
451 return skb_peek(&sch->q);
454 /* generic pseudo peek method for non-work-conserving qdisc */
455 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
457 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
459 sch->gso_skb = sch->dequeue(sch);
461 /* it's still part of the queue */
468 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
469 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
471 struct sk_buff *skb = sch->gso_skb;
477 skb = sch->dequeue(sch);
483 static inline void __qdisc_reset_queue(struct Qdisc *sch,
484 struct sk_buff_head *list)
487 * We do not know the backlog in bytes of this list, it
488 * is up to the caller to correct it
490 __skb_queue_purge(list);
493 static inline void qdisc_reset_queue(struct Qdisc *sch)
495 __qdisc_reset_queue(sch, &sch->q);
496 sch->qstats.backlog = 0;
499 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
500 struct sk_buff_head *list)
502 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
504 if (likely(skb != NULL)) {
505 unsigned int len = qdisc_pkt_len(skb);
513 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
515 return __qdisc_queue_drop(sch, &sch->q);
518 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
523 return NET_XMIT_DROP;
526 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
530 #ifdef CONFIG_NET_CLS_ACT
531 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
534 return NET_XMIT_SUCCESS;
539 return NET_XMIT_DROP;
542 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
543 long it will take to send a packet given its size.
545 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
547 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
550 slot >>= rtab->rate.cell_log;
552 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
553 return rtab->data[slot];
556 #ifdef CONFIG_NET_CLS_ACT
557 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
559 struct sk_buff *n = skb_clone(skb, gfp_mask);
562 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
563 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
564 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);