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 unsigned int (*select_queue)(struct Qdisc *, struct tcmsg *);
84 int (*graft)(struct Qdisc *, unsigned long cl,
85 struct Qdisc *, struct Qdisc **);
86 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
87 void (*qlen_notify)(struct Qdisc *, unsigned long);
89 /* Class manipulation routines */
90 unsigned long (*get)(struct Qdisc *, u32 classid);
91 void (*put)(struct Qdisc *, unsigned long);
92 int (*change)(struct Qdisc *, u32, u32,
93 struct nlattr **, unsigned long *);
94 int (*delete)(struct Qdisc *, unsigned long);
95 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
97 /* Filter manipulation */
98 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
99 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
101 void (*unbind_tcf)(struct Qdisc *, unsigned long);
103 /* rtnetlink specific */
104 int (*dump)(struct Qdisc *, unsigned long,
105 struct sk_buff *skb, struct tcmsg*);
106 int (*dump_stats)(struct Qdisc *, unsigned long,
112 struct Qdisc_ops *next;
113 const struct Qdisc_class_ops *cl_ops;
117 int (*enqueue)(struct sk_buff *, struct Qdisc *);
118 struct sk_buff * (*dequeue)(struct Qdisc *);
119 struct sk_buff * (*peek)(struct Qdisc *);
120 unsigned int (*drop)(struct Qdisc *);
122 int (*init)(struct Qdisc *, struct nlattr *arg);
123 void (*reset)(struct Qdisc *);
124 void (*destroy)(struct Qdisc *);
125 int (*change)(struct Qdisc *, struct nlattr *arg);
126 void (*attach)(struct Qdisc *);
128 int (*dump)(struct Qdisc *, struct sk_buff *);
129 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
131 struct module *owner;
143 struct tcf_proto_ops *next;
146 int (*classify)(struct sk_buff*, struct tcf_proto*,
147 struct tcf_result *);
148 int (*init)(struct tcf_proto*);
149 void (*destroy)(struct tcf_proto*);
151 unsigned long (*get)(struct tcf_proto*, u32 handle);
152 void (*put)(struct tcf_proto*, unsigned long);
153 int (*change)(struct tcf_proto*, unsigned long,
154 u32 handle, struct nlattr **,
156 int (*delete)(struct tcf_proto*, unsigned long);
157 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
159 /* rtnetlink specific */
160 int (*dump)(struct tcf_proto*, unsigned long,
161 struct sk_buff *skb, struct tcmsg*);
163 struct module *owner;
168 /* Fast access part */
169 struct tcf_proto *next;
171 int (*classify)(struct sk_buff*, struct tcf_proto*,
172 struct tcf_result *);
180 struct tcf_proto_ops *ops;
183 struct qdisc_skb_cb {
184 unsigned int pkt_len;
188 static inline int qdisc_qlen(struct Qdisc *q)
193 static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
195 return (struct qdisc_skb_cb *)skb->cb;
198 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
200 return &qdisc->q.lock;
203 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
205 return qdisc->dev_queue->qdisc;
208 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
210 return qdisc->dev_queue->qdisc_sleeping;
213 /* The qdisc root lock is a mechanism by which to top level
214 * of a qdisc tree can be locked from any qdisc node in the
215 * forest. This allows changing the configuration of some
216 * aspect of the qdisc tree while blocking out asynchronous
217 * qdisc access in the packet processing paths.
219 * It is only legal to do this when the root will not change
220 * on us. Otherwise we'll potentially lock the wrong qdisc
221 * root. This is enforced by holding the RTNL semaphore, which
222 * all users of this lock accessor must do.
224 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
226 struct Qdisc *root = qdisc_root(qdisc);
229 return qdisc_lock(root);
232 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
234 struct Qdisc *root = qdisc_root_sleeping(qdisc);
237 return qdisc_lock(root);
240 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
242 return qdisc->dev_queue->dev;
245 static inline void sch_tree_lock(struct Qdisc *q)
247 spin_lock_bh(qdisc_root_sleeping_lock(q));
250 static inline void sch_tree_unlock(struct Qdisc *q)
252 spin_unlock_bh(qdisc_root_sleeping_lock(q));
255 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
256 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
258 extern struct Qdisc noop_qdisc;
259 extern struct Qdisc_ops noop_qdisc_ops;
260 extern struct Qdisc_ops pfifo_fast_ops;
261 extern struct Qdisc_ops mq_qdisc_ops;
263 struct Qdisc_class_common
266 struct hlist_node hnode;
269 struct Qdisc_class_hash
271 struct hlist_head *hash;
272 unsigned int hashsize;
273 unsigned int hashmask;
274 unsigned int hashelems;
277 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
284 static inline struct Qdisc_class_common *
285 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
287 struct Qdisc_class_common *cl;
288 struct hlist_node *n;
291 h = qdisc_class_hash(id, hash->hashmask);
292 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
293 if (cl->classid == id)
299 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
300 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
301 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
302 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
303 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
305 extern void dev_init_scheduler(struct net_device *dev);
306 extern void dev_shutdown(struct net_device *dev);
307 extern void dev_activate(struct net_device *dev);
308 extern void dev_deactivate(struct net_device *dev);
309 extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
310 struct Qdisc *qdisc);
311 extern void qdisc_reset(struct Qdisc *qdisc);
312 extern void qdisc_destroy(struct Qdisc *qdisc);
313 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
314 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
315 struct Qdisc_ops *ops);
316 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
317 struct netdev_queue *dev_queue,
318 struct Qdisc_ops *ops, u32 parentid);
319 extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
320 struct qdisc_size_table *stab);
321 extern void tcf_destroy(struct tcf_proto *tp);
322 extern void tcf_destroy_chain(struct tcf_proto **fl);
324 /* Reset all TX qdiscs of a device. */
325 static inline void qdisc_reset_all_tx(struct net_device *dev)
328 for (i = 0; i < dev->num_tx_queues; i++)
329 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
332 /* Are all TX queues of the device empty? */
333 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
336 for (i = 0; i < dev->num_tx_queues; i++) {
337 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
338 const struct Qdisc *q = txq->qdisc;
346 /* Are any of the TX qdiscs changing? */
347 static inline bool qdisc_tx_changing(struct net_device *dev)
350 for (i = 0; i < dev->num_tx_queues; i++) {
351 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
352 if (txq->qdisc != txq->qdisc_sleeping)
358 /* Is the device using the noop qdisc on all queues? */
359 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
362 for (i = 0; i < dev->num_tx_queues; i++) {
363 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
364 if (txq->qdisc != &noop_qdisc)
370 static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
372 return qdisc_skb_cb(skb)->pkt_len;
375 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
376 enum net_xmit_qdisc_t {
377 __NET_XMIT_STOLEN = 0x00010000,
378 __NET_XMIT_BYPASS = 0x00020000,
381 #ifdef CONFIG_NET_CLS_ACT
382 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
384 #define net_xmit_drop_count(e) (1)
387 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
389 #ifdef CONFIG_NET_SCHED
391 qdisc_calculate_pkt_len(skb, sch->stab);
393 return sch->enqueue(skb, sch);
396 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
398 qdisc_skb_cb(skb)->pkt_len = skb->len;
399 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
402 static inline void __qdisc_update_bstats(struct Qdisc *sch, unsigned int len)
404 sch->bstats.bytes += len;
405 sch->bstats.packets++;
408 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
409 struct sk_buff_head *list)
411 __skb_queue_tail(list, skb);
412 sch->qstats.backlog += qdisc_pkt_len(skb);
413 __qdisc_update_bstats(sch, qdisc_pkt_len(skb));
415 return NET_XMIT_SUCCESS;
418 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
420 return __qdisc_enqueue_tail(skb, sch, &sch->q);
423 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
424 struct sk_buff_head *list)
426 struct sk_buff *skb = __skb_dequeue(list);
428 if (likely(skb != NULL))
429 sch->qstats.backlog -= qdisc_pkt_len(skb);
434 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
436 return __qdisc_dequeue_head(sch, &sch->q);
439 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
440 struct sk_buff_head *list)
442 struct sk_buff *skb = __skb_dequeue_tail(list);
444 if (likely(skb != NULL))
445 sch->qstats.backlog -= qdisc_pkt_len(skb);
450 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
452 return __qdisc_dequeue_tail(sch, &sch->q);
455 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
457 return skb_peek(&sch->q);
460 /* generic pseudo peek method for non-work-conserving qdisc */
461 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
463 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
465 sch->gso_skb = sch->dequeue(sch);
467 /* it's still part of the queue */
474 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
475 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
477 struct sk_buff *skb = sch->gso_skb;
483 skb = sch->dequeue(sch);
489 static inline void __qdisc_reset_queue(struct Qdisc *sch,
490 struct sk_buff_head *list)
493 * We do not know the backlog in bytes of this list, it
494 * is up to the caller to correct it
496 __skb_queue_purge(list);
499 static inline void qdisc_reset_queue(struct Qdisc *sch)
501 __qdisc_reset_queue(sch, &sch->q);
502 sch->qstats.backlog = 0;
505 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
506 struct sk_buff_head *list)
508 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
510 if (likely(skb != NULL)) {
511 unsigned int len = qdisc_pkt_len(skb);
519 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
521 return __qdisc_queue_drop(sch, &sch->q);
524 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
529 return NET_XMIT_DROP;
532 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
536 #ifdef CONFIG_NET_CLS_ACT
537 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
540 return NET_XMIT_SUCCESS;
545 return NET_XMIT_DROP;
548 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
549 long it will take to send a packet given its size.
551 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
553 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
556 slot >>= rtab->rate.cell_log;
558 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
559 return rtab->data[slot];
562 #ifdef CONFIG_NET_CLS_ACT
563 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
565 struct sk_buff *n = skb_clone(skb, gfp_mask);
568 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
569 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
570 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);