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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __NET_PKT_SCHED_H
2#define __NET_PKT_SCHED_H
3
Patrick McHardy538e43a2006-01-08 22:12:03 -08004#include <linux/jiffies.h>
Patrick McHardy641b9e02007-03-16 01:18:42 -07005#include <linux/ktime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <net/sch_generic.h>
7
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +00008struct qdisc_walker {
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 int stop;
10 int skip;
11 int count;
12 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
13};
14
Eric Dumazet5d944c62010-03-31 07:06:04 +000015#define QDISC_ALIGNTO 64
Thomas Graf3d54b822005-07-05 14:15:09 -070016#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18static inline void *qdisc_priv(struct Qdisc *q)
19{
Thomas Graf3d54b822005-07-05 14:15:09 -070020 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
Linus Torvalds1da177e2005-04-16 15:20:36 -070021}
22
23/*
24 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
25
26 Normal IP packet size ~ 512byte, hence:
27
28 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
29 10Mbit ethernet.
30
31 10msec resolution -> <50Kbit/sec.
32
33 The result: [34]86 is not good choice for QoS router :-(
34
Lucas De Marchi25985ed2011-03-30 22:57:33 -030035 The things are not so bad, because we may use artificial
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 clock evaluated by integration of network data flow
37 in the most critical places.
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 */
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040typedef u64 psched_time_t;
41typedef long psched_tdiff_t;
42
Jarek Poplawskia4a710c2009-06-08 22:05:13 +000043/* Avoid doing 64 bit divide */
44#define PSCHED_SHIFT 6
Jarek Poplawskica44d6e2009-06-15 02:31:47 -070045#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
46#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Jarek Poplawskica44d6e2009-06-15 02:31:47 -070048#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
Patrick McHardya0849802007-03-23 11:28:30 -070049#define PSCHED_PASTPERFECT 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Patrick McHardy3bebcda2007-03-23 11:29:25 -070051static inline psched_time_t psched_get_time(void)
52{
Jarek Poplawskica44d6e2009-06-15 02:31:47 -070053 return PSCHED_NS2TICKS(ktime_to_ns(ktime_get()));
Patrick McHardy3bebcda2007-03-23 11:29:25 -070054}
55
Patrick McHardy03cc45c2007-03-23 11:29:11 -070056static inline psched_tdiff_t
57psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
58{
59 return min(tv1 - tv2, bound);
60}
61
Patrick McHardy41794772007-03-16 01:19:15 -070062struct qdisc_watchdog {
63 struct hrtimer timer;
64 struct Qdisc *qdisc;
65};
66
67extern void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
68extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
69 psched_time_t expires);
70extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072extern struct Qdisc_ops pfifo_qdisc_ops;
73extern struct Qdisc_ops bfifo_qdisc_ops;
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +000074extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Patrick McHardyfb0305c2008-07-05 23:40:21 -070076extern int fifo_set_limit(struct Qdisc *q, unsigned int limit);
77extern struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
78 unsigned int limit);
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080extern int register_qdisc(struct Qdisc_ops *qops);
81extern int unregister_qdisc(struct Qdisc_ops *qops);
Jarek Poplawskif6e0b232008-08-22 03:24:05 -070082extern void qdisc_list_del(struct Qdisc *q);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
84extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
Patrick McHardy1e904742008-01-22 22:11:17 -080086 struct nlattr *tab);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -070088extern void qdisc_put_stab(struct qdisc_size_table *tab);
Jarek Poplawskib00355d2009-02-01 01:12:42 -080089extern void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc);
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +000090extern int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
91 struct net_device *dev, struct netdev_queue *txq,
92 spinlock_t *root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
David S. Miller37437bb2008-07-16 02:15:04 -070094extern void __qdisc_run(struct Qdisc *q);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
David S. Miller37437bb2008-07-16 02:15:04 -070096static inline void qdisc_run(struct Qdisc *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
Eric Dumazetbc135b22010-06-02 03:23:51 -070098 if (qdisc_run_begin(q))
David S. Miller37437bb2008-07-16 02:15:04 -070099 __qdisc_run(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
Patrick McHardy73ca4912007-07-15 00:02:31 -0700102extern int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp,
103 struct tcf_result *res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
Patrick McHardy73ca4912007-07-15 00:02:31 -0700105 struct tcf_result *res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107/* Calculate maximal size of packet seen by hard_start_xmit
108 routine of this device.
109 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700110static inline unsigned psched_mtu(const struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700112 return dev->mtu + dev->hard_header_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
114
115#endif