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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>
Jiri Pirkod8b96052015-01-13 17:13:43 +01006#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <net/sch_generic.h>
8
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +00009struct qdisc_walker {
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 int stop;
11 int skip;
12 int count;
13 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
14};
15
Eric Dumazet5d944c62010-03-31 07:06:04 +000016#define QDISC_ALIGNTO 64
Thomas Graf3d54b822005-07-05 14:15:09 -070017#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19static inline void *qdisc_priv(struct Qdisc *q)
20{
Thomas Graf3d54b822005-07-05 14:15:09 -070021 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
Linus Torvalds1da177e2005-04-16 15:20:36 -070022}
23
24/*
25 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
26
27 Normal IP packet size ~ 512byte, hence:
28
29 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
30 10Mbit ethernet.
31
32 10msec resolution -> <50Kbit/sec.
33
34 The result: [34]86 is not good choice for QoS router :-(
35
Lucas De Marchi25985ed2011-03-30 22:57:33 -030036 The things are not so bad, because we may use artificial
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 clock evaluated by integration of network data flow
38 in the most critical places.
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 */
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041typedef u64 psched_time_t;
42typedef long psched_tdiff_t;
43
Jarek Poplawskia4a710c2009-06-08 22:05:13 +000044/* Avoid doing 64 bit divide */
45#define PSCHED_SHIFT 6
Jarek Poplawskica44d6e2009-06-15 02:31:47 -070046#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
47#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Jarek Poplawskica44d6e2009-06-15 02:31:47 -070049#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
Patrick McHardya0849802007-03-23 11:28:30 -070050#define PSCHED_PASTPERFECT 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Patrick McHardy3bebcda2007-03-23 11:29:25 -070052static inline psched_time_t psched_get_time(void)
53{
Eric Dumazetd2de8752014-08-22 18:32:09 -070054 return PSCHED_NS2TICKS(ktime_get_ns());
Patrick McHardy3bebcda2007-03-23 11:29:25 -070055}
56
Patrick McHardy03cc45c2007-03-23 11:29:11 -070057static inline psched_tdiff_t
58psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
59{
60 return min(tv1 - tv2, bound);
61}
62
Patrick McHardy41794772007-03-16 01:19:15 -070063struct qdisc_watchdog {
Eric Dumazeta9efad82016-05-23 14:24:56 -070064 u64 last_expires;
Patrick McHardy41794772007-03-16 01:19:15 -070065 struct hrtimer timer;
66 struct Qdisc *qdisc;
67};
68
Joe Perches5c152572013-07-30 22:47:13 -070069void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
Eric Dumazet45f50be2016-06-10 16:41:39 -070070void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
Jiri Pirko34c5d292013-02-12 00:12:04 +000071
72static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
73 psched_time_t expires)
74{
Eric Dumazet45f50be2016-06-10 16:41:39 -070075 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
Jiri Pirko34c5d292013-02-12 00:12:04 +000076}
77
Joe Perches5c152572013-07-30 22:47:13 -070078void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
Patrick McHardy41794772007-03-16 01:19:15 -070079
Linus Torvalds1da177e2005-04-16 15:20:36 -070080extern struct Qdisc_ops pfifo_qdisc_ops;
81extern struct Qdisc_ops bfifo_qdisc_ops;
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +000082extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Joe Perches5c152572013-07-30 22:47:13 -070084int fifo_set_limit(struct Qdisc *q, unsigned int limit);
85struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
86 unsigned int limit);
Patrick McHardyfb0305c2008-07-05 23:40:21 -070087
Joe Perches5c152572013-07-30 22:47:13 -070088int register_qdisc(struct Qdisc_ops *qops);
89int unregister_qdisc(struct Qdisc_ops *qops);
stephen hemminger6da7c8f2013-08-27 16:19:08 -070090void qdisc_get_default(char *id, size_t len);
91int qdisc_set_default(const char *id);
92
Jiri Kosina59cc1f62016-08-10 11:05:15 +020093void qdisc_hash_add(struct Qdisc *q);
94void qdisc_hash_del(struct Qdisc *q);
Joe Perches5c152572013-07-30 22:47:13 -070095struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
96struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
97struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
98 struct nlattr *tab);
99void qdisc_put_rtab(struct qdisc_rate_table *tab);
100void qdisc_put_stab(struct qdisc_size_table *tab);
Florian Westphal6e765a02014-06-11 20:35:18 +0200101void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
Joe Perches5c152572013-07-30 22:47:13 -0700102int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
103 struct net_device *dev, struct netdev_queue *txq,
Eric Dumazet55a93b32014-10-03 15:31:07 -0700104 spinlock_t *root_lock, bool validate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Joe Perches5c152572013-07-30 22:47:13 -0700106void __qdisc_run(struct Qdisc *q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
David S. Miller37437bb2008-07-16 02:15:04 -0700108static inline void qdisc_run(struct Qdisc *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
Eric Dumazetbc135b22010-06-02 03:23:51 -0700110 if (qdisc_run_begin(q))
David S. Miller37437bb2008-07-16 02:15:04 -0700111 __qdisc_run(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
Joe Perches5c152572013-07-30 22:47:13 -0700114int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
Daniel Borkmann3b3ae882015-08-26 23:00:06 +0200115 struct tcf_result *res, bool compat_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Jiri Pirkod8b96052015-01-13 17:13:43 +0100117static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
118{
119 /* We need to take extra care in case the skb came via
120 * vlan accelerated path. In that case, use skb->vlan_proto
121 * as the original vlan header was already stripped.
122 */
Jiri Pirkodf8a39d2015-01-13 17:13:44 +0100123 if (skb_vlan_tag_present(skb))
Jiri Pirkod8b96052015-01-13 17:13:43 +0100124 return skb->vlan_proto;
125 return skb->protocol;
126}
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128/* Calculate maximal size of packet seen by hard_start_xmit
129 routine of this device.
130 */
Eric Dumazet95c96172012-04-15 05:58:06 +0000131static inline unsigned int psched_mtu(const struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700133 return dev->mtu + dev->hard_header_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
136#endif