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
49 struct Qdisc_ops
*ops
;
50 struct qdisc_size_table
*stab
;
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
;
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
,
70 /* This field is deprecated, but it is still used by CBQ
71 * and it will live until better solution will be invented.
73 struct Qdisc
*__parent
;
76 struct Qdisc_class_ops
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);
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
);
92 /* Filter manipulation */
93 struct tcf_proto
** (*tcf_chain
)(struct Qdisc
*, unsigned long);
94 unsigned long (*bind_tcf
)(struct Qdisc
*, unsigned long,
96 void (*unbind_tcf
)(struct Qdisc
*, unsigned long);
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,
107 struct Qdisc_ops
*next
;
108 const struct Qdisc_class_ops
*cl_ops
;
112 int (*enqueue
)(struct sk_buff
*, struct Qdisc
*);
113 struct sk_buff
* (*dequeue
)(struct Qdisc
*);
114 struct sk_buff
* (*peek
)(struct Qdisc
*);
115 int (*requeue
)(struct sk_buff
*, struct Qdisc
*);
116 unsigned int (*drop
)(struct Qdisc
*);
118 int (*init
)(struct Qdisc
*, struct nlattr
*arg
);
119 void (*reset
)(struct Qdisc
*);
120 void (*destroy
)(struct Qdisc
*);
121 int (*change
)(struct Qdisc
*, struct nlattr
*arg
);
123 int (*dump
)(struct Qdisc
*, struct sk_buff
*);
124 int (*dump_stats
)(struct Qdisc
*, struct gnet_dump
*);
126 struct module
*owner
;
138 struct tcf_proto_ops
*next
;
141 int (*classify
)(struct sk_buff
*, struct tcf_proto
*,
142 struct tcf_result
*);
143 int (*init
)(struct tcf_proto
*);
144 void (*destroy
)(struct tcf_proto
*);
146 unsigned long (*get
)(struct tcf_proto
*, u32 handle
);
147 void (*put
)(struct tcf_proto
*, unsigned long);
148 int (*change
)(struct tcf_proto
*, unsigned long,
149 u32 handle
, struct nlattr
**,
151 int (*delete)(struct tcf_proto
*, unsigned long);
152 void (*walk
)(struct tcf_proto
*, struct tcf_walker
*arg
);
154 /* rtnetlink specific */
155 int (*dump
)(struct tcf_proto
*, unsigned long,
156 struct sk_buff
*skb
, struct tcmsg
*);
158 struct module
*owner
;
163 /* Fast access part */
164 struct tcf_proto
*next
;
166 int (*classify
)(struct sk_buff
*, struct tcf_proto
*,
167 struct tcf_result
*);
175 struct tcf_proto_ops
*ops
;
178 struct qdisc_skb_cb
{
179 unsigned int pkt_len
;
183 static inline struct qdisc_skb_cb
*qdisc_skb_cb(struct sk_buff
*skb
)
185 return (struct qdisc_skb_cb
*)skb
->cb
;
188 static inline spinlock_t
*qdisc_lock(struct Qdisc
*qdisc
)
190 return &qdisc
->q
.lock
;
193 static inline struct Qdisc
*qdisc_root(struct Qdisc
*qdisc
)
195 return qdisc
->dev_queue
->qdisc
;
198 static inline struct Qdisc
*qdisc_root_sleeping(struct Qdisc
*qdisc
)
200 return qdisc
->dev_queue
->qdisc_sleeping
;
203 /* The qdisc root lock is a mechanism by which to top level
204 * of a qdisc tree can be locked from any qdisc node in the
205 * forest. This allows changing the configuration of some
206 * aspect of the qdisc tree while blocking out asynchronous
207 * qdisc access in the packet processing paths.
209 * It is only legal to do this when the root will not change
210 * on us. Otherwise we'll potentially lock the wrong qdisc
211 * root. This is enforced by holding the RTNL semaphore, which
212 * all users of this lock accessor must do.
214 static inline spinlock_t
*qdisc_root_lock(struct Qdisc
*qdisc
)
216 struct Qdisc
*root
= qdisc_root(qdisc
);
219 return qdisc_lock(root
);
222 static inline spinlock_t
*qdisc_root_sleeping_lock(struct Qdisc
*qdisc
)
224 struct Qdisc
*root
= qdisc_root_sleeping(qdisc
);
227 return qdisc_lock(root
);
230 static inline struct net_device
*qdisc_dev(struct Qdisc
*qdisc
)
232 return qdisc
->dev_queue
->dev
;
235 static inline void sch_tree_lock(struct Qdisc
*q
)
237 spin_lock_bh(qdisc_root_sleeping_lock(q
));
240 static inline void sch_tree_unlock(struct Qdisc
*q
)
242 spin_unlock_bh(qdisc_root_sleeping_lock(q
));
245 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
246 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
248 extern struct Qdisc noop_qdisc
;
249 extern struct Qdisc_ops noop_qdisc_ops
;
251 struct Qdisc_class_common
254 struct hlist_node hnode
;
257 struct Qdisc_class_hash
259 struct hlist_head
*hash
;
260 unsigned int hashsize
;
261 unsigned int hashmask
;
262 unsigned int hashelems
;
265 static inline unsigned int qdisc_class_hash(u32 id
, u32 mask
)
272 static inline struct Qdisc_class_common
*
273 qdisc_class_find(struct Qdisc_class_hash
*hash
, u32 id
)
275 struct Qdisc_class_common
*cl
;
276 struct hlist_node
*n
;
279 h
= qdisc_class_hash(id
, hash
->hashmask
);
280 hlist_for_each_entry(cl
, n
, &hash
->hash
[h
], hnode
) {
281 if (cl
->classid
== id
)
287 extern int qdisc_class_hash_init(struct Qdisc_class_hash
*);
288 extern void qdisc_class_hash_insert(struct Qdisc_class_hash
*, struct Qdisc_class_common
*);
289 extern void qdisc_class_hash_remove(struct Qdisc_class_hash
*, struct Qdisc_class_common
*);
290 extern void qdisc_class_hash_grow(struct Qdisc
*, struct Qdisc_class_hash
*);
291 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash
*);
293 extern void dev_init_scheduler(struct net_device
*dev
);
294 extern void dev_shutdown(struct net_device
*dev
);
295 extern void dev_activate(struct net_device
*dev
);
296 extern void dev_deactivate(struct net_device
*dev
);
297 extern void qdisc_reset(struct Qdisc
*qdisc
);
298 extern void qdisc_destroy(struct Qdisc
*qdisc
);
299 extern void qdisc_tree_decrease_qlen(struct Qdisc
*qdisc
, unsigned int n
);
300 extern struct Qdisc
*qdisc_alloc(struct netdev_queue
*dev_queue
,
301 struct Qdisc_ops
*ops
);
302 extern struct Qdisc
*qdisc_create_dflt(struct net_device
*dev
,
303 struct netdev_queue
*dev_queue
,
304 struct Qdisc_ops
*ops
, u32 parentid
);
305 extern void qdisc_calculate_pkt_len(struct sk_buff
*skb
,
306 struct qdisc_size_table
*stab
);
307 extern void tcf_destroy(struct tcf_proto
*tp
);
308 extern void tcf_destroy_chain(struct tcf_proto
**fl
);
310 /* Reset all TX qdiscs of a device. */
311 static inline void qdisc_reset_all_tx(struct net_device
*dev
)
314 for (i
= 0; i
< dev
->num_tx_queues
; i
++)
315 qdisc_reset(netdev_get_tx_queue(dev
, i
)->qdisc
);
318 /* Are all TX queues of the device empty? */
319 static inline bool qdisc_all_tx_empty(const struct net_device
*dev
)
322 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
323 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
324 const struct Qdisc
*q
= txq
->qdisc
;
332 /* Are any of the TX qdiscs changing? */
333 static inline bool qdisc_tx_changing(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 if (txq
->qdisc
!= txq
->qdisc_sleeping
)
344 /* Is the device using the noop qdisc on all queues? */
345 static inline bool qdisc_tx_is_noop(const struct net_device
*dev
)
348 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
349 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
350 if (txq
->qdisc
!= &noop_qdisc
)
356 static inline unsigned int qdisc_pkt_len(struct sk_buff
*skb
)
358 return qdisc_skb_cb(skb
)->pkt_len
;
361 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
362 enum net_xmit_qdisc_t
{
363 __NET_XMIT_STOLEN
= 0x00010000,
364 __NET_XMIT_BYPASS
= 0x00020000,
367 #ifdef CONFIG_NET_CLS_ACT
368 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
370 #define net_xmit_drop_count(e) (1)
373 static inline int qdisc_enqueue(struct sk_buff
*skb
, struct Qdisc
*sch
)
375 #ifdef CONFIG_NET_SCHED
377 qdisc_calculate_pkt_len(skb
, sch
->stab
);
379 return sch
->enqueue(skb
, sch
);
382 static inline int qdisc_enqueue_root(struct sk_buff
*skb
, struct Qdisc
*sch
)
384 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
385 return qdisc_enqueue(skb
, sch
) & NET_XMIT_MASK
;
388 static inline int __qdisc_enqueue_tail(struct sk_buff
*skb
, struct Qdisc
*sch
,
389 struct sk_buff_head
*list
)
391 __skb_queue_tail(list
, skb
);
392 sch
->qstats
.backlog
+= qdisc_pkt_len(skb
);
393 sch
->bstats
.bytes
+= qdisc_pkt_len(skb
);
394 sch
->bstats
.packets
++;
396 return NET_XMIT_SUCCESS
;
399 static inline int qdisc_enqueue_tail(struct sk_buff
*skb
, struct Qdisc
*sch
)
401 return __qdisc_enqueue_tail(skb
, sch
, &sch
->q
);
404 static inline struct sk_buff
*__qdisc_dequeue_head(struct Qdisc
*sch
,
405 struct sk_buff_head
*list
)
407 struct sk_buff
*skb
= __skb_dequeue(list
);
409 if (likely(skb
!= NULL
))
410 sch
->qstats
.backlog
-= qdisc_pkt_len(skb
);
415 static inline struct sk_buff
*qdisc_dequeue_head(struct Qdisc
*sch
)
417 return __qdisc_dequeue_head(sch
, &sch
->q
);
420 static inline struct sk_buff
*__qdisc_dequeue_tail(struct Qdisc
*sch
,
421 struct sk_buff_head
*list
)
423 struct sk_buff
*skb
= __skb_dequeue_tail(list
);
425 if (likely(skb
!= NULL
))
426 sch
->qstats
.backlog
-= qdisc_pkt_len(skb
);
431 static inline struct sk_buff
*qdisc_dequeue_tail(struct Qdisc
*sch
)
433 return __qdisc_dequeue_tail(sch
, &sch
->q
);
436 static inline struct sk_buff
*qdisc_peek_head(struct Qdisc
*sch
)
438 return skb_peek(&sch
->q
);
441 /* generic pseudo peek method for non-work-conserving qdisc */
442 static inline struct sk_buff
*qdisc_peek_dequeued(struct Qdisc
*sch
)
444 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
446 sch
->gso_skb
= sch
->dequeue(sch
);
451 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
452 static inline struct sk_buff
*qdisc_dequeue_peeked(struct Qdisc
*sch
)
454 struct sk_buff
*skb
= sch
->gso_skb
;
459 skb
= sch
->dequeue(sch
);
464 static inline int __qdisc_requeue(struct sk_buff
*skb
, struct Qdisc
*sch
,
465 struct sk_buff_head
*list
)
467 __skb_queue_head(list
, skb
);
468 sch
->qstats
.backlog
+= qdisc_pkt_len(skb
);
469 sch
->qstats
.requeues
++;
471 return NET_XMIT_SUCCESS
;
474 static inline int qdisc_requeue(struct sk_buff
*skb
, struct Qdisc
*sch
)
476 return __qdisc_requeue(skb
, sch
, &sch
->q
);
479 static inline void __qdisc_reset_queue(struct Qdisc
*sch
,
480 struct sk_buff_head
*list
)
483 * We do not know the backlog in bytes of this list, it
484 * is up to the caller to correct it
486 __skb_queue_purge(list
);
489 static inline void qdisc_reset_queue(struct Qdisc
*sch
)
491 __qdisc_reset_queue(sch
, &sch
->q
);
492 sch
->qstats
.backlog
= 0;
495 static inline unsigned int __qdisc_queue_drop(struct Qdisc
*sch
,
496 struct sk_buff_head
*list
)
498 struct sk_buff
*skb
= __qdisc_dequeue_tail(sch
, list
);
500 if (likely(skb
!= NULL
)) {
501 unsigned int len
= qdisc_pkt_len(skb
);
509 static inline unsigned int qdisc_queue_drop(struct Qdisc
*sch
)
511 return __qdisc_queue_drop(sch
, &sch
->q
);
514 static inline int qdisc_drop(struct sk_buff
*skb
, struct Qdisc
*sch
)
519 return NET_XMIT_DROP
;
522 static inline int qdisc_reshape_fail(struct sk_buff
*skb
, struct Qdisc
*sch
)
526 #ifdef CONFIG_NET_CLS_ACT
527 if (sch
->reshape_fail
== NULL
|| sch
->reshape_fail(skb
, sch
))
530 return NET_XMIT_SUCCESS
;
535 return NET_XMIT_DROP
;
538 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
539 long it will take to send a packet given its size.
541 static inline u32
qdisc_l2t(struct qdisc_rate_table
* rtab
, unsigned int pktlen
)
543 int slot
= pktlen
+ rtab
->rate
.cell_align
+ rtab
->rate
.overhead
;
546 slot
>>= rtab
->rate
.cell_log
;
548 return (rtab
->data
[255]*(slot
>> 8) + rtab
->data
[slot
& 0xFF]);
549 return rtab
->data
[slot
];
552 #ifdef CONFIG_NET_CLS_ACT
553 static inline struct sk_buff
*skb_act_clone(struct sk_buff
*skb
, gfp_t gfp_mask
)
555 struct sk_buff
*n
= skb_clone(skb
, gfp_mask
);
558 n
->tc_verd
= SET_TC_VERD(n
->tc_verd
, 0);
559 n
->tc_verd
= CLR_TC_OK2MUNGE(n
->tc_verd
);
560 n
->tc_verd
= CLR_TC_MUNGED(n
->tc_verd
);