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1da177e4 LT |
1 | #ifndef __NET_PKT_SCHED_H |
2 | #define __NET_PKT_SCHED_H | |
3 | ||
538e43a4 | 4 | #include <linux/jiffies.h> |
641b9e0e | 5 | #include <linux/ktime.h> |
d8b9605d | 6 | #include <linux/if_vlan.h> |
1da177e4 | 7 | #include <net/sch_generic.h> |
861932ec | 8 | #include <uapi/linux/pkt_sched.h> |
1da177e4 | 9 | |
d0a81f67 JDB |
10 | #define DEFAULT_TX_QUEUE_LEN 1000 |
11 | ||
fd2c3ef7 | 12 | struct qdisc_walker { |
1da177e4 LT |
13 | int stop; |
14 | int skip; | |
15 | int count; | |
16 | int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); | |
17 | }; | |
18 | ||
5d944c64 | 19 | #define QDISC_ALIGNTO 64 |
3d54b82f | 20 | #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1)) |
1da177e4 LT |
21 | |
22 | static inline void *qdisc_priv(struct Qdisc *q) | |
23 | { | |
3d54b82f | 24 | return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc)); |
1da177e4 LT |
25 | } |
26 | ||
27 | /* | |
28 | Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth | |
29 | ||
30 | Normal IP packet size ~ 512byte, hence: | |
31 | ||
32 | 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for | |
33 | 10Mbit ethernet. | |
34 | ||
35 | 10msec resolution -> <50Kbit/sec. | |
36 | ||
37 | The result: [34]86 is not good choice for QoS router :-( | |
38 | ||
25985edc | 39 | The things are not so bad, because we may use artificial |
1da177e4 LT |
40 | clock evaluated by integration of network data flow |
41 | in the most critical places. | |
1da177e4 LT |
42 | */ |
43 | ||
1da177e4 LT |
44 | typedef u64 psched_time_t; |
45 | typedef long psched_tdiff_t; | |
46 | ||
a4a710c4 JP |
47 | /* Avoid doing 64 bit divide */ |
48 | #define PSCHED_SHIFT 6 | |
ca44d6e6 JP |
49 | #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) |
50 | #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) | |
1da177e4 | 51 | |
ca44d6e6 | 52 | #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) |
a084980d | 53 | #define PSCHED_PASTPERFECT 0 |
1da177e4 | 54 | |
3bebcda2 PM |
55 | static inline psched_time_t psched_get_time(void) |
56 | { | |
d2de875c | 57 | return PSCHED_NS2TICKS(ktime_get_ns()); |
3bebcda2 PM |
58 | } |
59 | ||
03cc45c0 PM |
60 | static inline psched_tdiff_t |
61 | psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) | |
62 | { | |
63 | return min(tv1 - tv2, bound); | |
64 | } | |
65 | ||
4179477f | 66 | struct qdisc_watchdog { |
a9efad8b | 67 | u64 last_expires; |
4179477f PM |
68 | struct hrtimer timer; |
69 | struct Qdisc *qdisc; | |
70 | }; | |
71 | ||
5c15257f | 72 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); |
45f50bed | 73 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires); |
34c5d292 JP |
74 | |
75 | static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, | |
76 | psched_time_t expires) | |
77 | { | |
45f50bed | 78 | qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); |
34c5d292 JP |
79 | } |
80 | ||
5c15257f | 81 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); |
4179477f | 82 | |
1da177e4 LT |
83 | extern struct Qdisc_ops pfifo_qdisc_ops; |
84 | extern struct Qdisc_ops bfifo_qdisc_ops; | |
57dbb2d8 | 85 | extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; |
1da177e4 | 86 | |
5c15257f JP |
87 | int fifo_set_limit(struct Qdisc *q, unsigned int limit); |
88 | struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, | |
89 | unsigned int limit); | |
90 | ||
91 | int register_qdisc(struct Qdisc_ops *qops); | |
92 | int unregister_qdisc(struct Qdisc_ops *qops); | |
6da7c8fc | 93 | void qdisc_get_default(char *id, size_t len); |
94 | int qdisc_set_default(const char *id); | |
95 | ||
49b49971 | 96 | void qdisc_hash_add(struct Qdisc *q, bool invisible); |
59cc1f61 | 97 | void qdisc_hash_del(struct Qdisc *q); |
5c15257f JP |
98 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); |
99 | struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); | |
100 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, | |
101 | struct nlattr *tab); | |
102 | void qdisc_put_rtab(struct qdisc_rate_table *tab); | |
103 | void qdisc_put_stab(struct qdisc_size_table *tab); | |
6e765a00 | 104 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); |
5c15257f JP |
105 | int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
106 | struct net_device *dev, struct netdev_queue *txq, | |
55a93b3e | 107 | spinlock_t *root_lock, bool validate); |
5c15257f JP |
108 | |
109 | void __qdisc_run(struct Qdisc *q); | |
1da177e4 | 110 | |
37437bb2 | 111 | static inline void qdisc_run(struct Qdisc *q) |
1da177e4 | 112 | { |
bc135b23 | 113 | if (qdisc_run_begin(q)) |
37437bb2 | 114 | __qdisc_run(q); |
1da177e4 LT |
115 | } |
116 | ||
d8b9605d JP |
117 | static 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 | */ | |
df8a39de | 123 | if (skb_vlan_tag_present(skb)) |
d8b9605d JP |
124 | return skb->vlan_proto; |
125 | return skb->protocol; | |
126 | } | |
127 | ||
1da177e4 LT |
128 | /* Calculate maximal size of packet seen by hard_start_xmit |
129 | routine of this device. | |
130 | */ | |
95c96174 | 131 | static inline unsigned int psched_mtu(const struct net_device *dev) |
1da177e4 | 132 | { |
3b04ddde | 133 | return dev->mtu + dev->hard_header_len; |
1da177e4 LT |
134 | } |
135 | ||
861932ec JP |
136 | static inline bool is_classid_clsact_ingress(u32 classid) |
137 | { | |
138 | /* This also returns true for ingress qdisc */ | |
139 | return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) && | |
140 | TC_H_MIN(classid) != TC_H_MIN(TC_H_MIN_EGRESS); | |
141 | } | |
142 | ||
143 | static inline bool is_classid_clsact_egress(u32 classid) | |
144 | { | |
145 | return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) && | |
146 | TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_EGRESS); | |
147 | } | |
148 | ||
1da177e4 | 149 | #endif |