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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __NET_PKT_SCHED_H |
3 | #define __NET_PKT_SCHED_H | |
4 | ||
538e43a4 | 5 | #include <linux/jiffies.h> |
641b9e0e | 6 | #include <linux/ktime.h> |
d8b9605d | 7 | #include <linux/if_vlan.h> |
1da177e4 | 8 | #include <net/sch_generic.h> |
861932ec | 9 | #include <uapi/linux/pkt_sched.h> |
1da177e4 | 10 | |
d0a81f67 JDB |
11 | #define DEFAULT_TX_QUEUE_LEN 1000 |
12 | ||
fd2c3ef7 | 13 | struct qdisc_walker { |
1da177e4 LT |
14 | int stop; |
15 | int skip; | |
16 | int count; | |
17 | int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); | |
18 | }; | |
19 | ||
5d944c64 | 20 | #define QDISC_ALIGNTO 64 |
3d54b82f | 21 | #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1)) |
1da177e4 LT |
22 | |
23 | static inline void *qdisc_priv(struct Qdisc *q) | |
24 | { | |
3d54b82f | 25 | return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc)); |
1da177e4 LT |
26 | } |
27 | ||
28 | /* | |
29 | Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth | |
30 | ||
31 | Normal IP packet size ~ 512byte, hence: | |
32 | ||
33 | 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for | |
34 | 10Mbit ethernet. | |
35 | ||
36 | 10msec resolution -> <50Kbit/sec. | |
37 | ||
38 | The result: [34]86 is not good choice for QoS router :-( | |
39 | ||
25985edc | 40 | The things are not so bad, because we may use artificial |
1da177e4 LT |
41 | clock evaluated by integration of network data flow |
42 | in the most critical places. | |
1da177e4 LT |
43 | */ |
44 | ||
1da177e4 LT |
45 | typedef u64 psched_time_t; |
46 | typedef long psched_tdiff_t; | |
47 | ||
a4a710c4 JP |
48 | /* Avoid doing 64 bit divide */ |
49 | #define PSCHED_SHIFT 6 | |
ca44d6e6 JP |
50 | #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) |
51 | #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) | |
1da177e4 | 52 | |
ca44d6e6 | 53 | #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) |
a084980d | 54 | #define PSCHED_PASTPERFECT 0 |
1da177e4 | 55 | |
3bebcda2 PM |
56 | static inline psched_time_t psched_get_time(void) |
57 | { | |
d2de875c | 58 | return PSCHED_NS2TICKS(ktime_get_ns()); |
3bebcda2 PM |
59 | } |
60 | ||
03cc45c0 PM |
61 | static inline psched_tdiff_t |
62 | psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) | |
63 | { | |
64 | return min(tv1 - tv2, bound); | |
65 | } | |
66 | ||
4179477f | 67 | struct qdisc_watchdog { |
a9efad8b | 68 | u64 last_expires; |
4179477f PM |
69 | struct hrtimer timer; |
70 | struct Qdisc *qdisc; | |
71 | }; | |
72 | ||
5c15257f | 73 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); |
45f50bed | 74 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires); |
34c5d292 JP |
75 | |
76 | static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, | |
77 | psched_time_t expires) | |
78 | { | |
45f50bed | 79 | qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); |
34c5d292 JP |
80 | } |
81 | ||
5c15257f | 82 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); |
4179477f | 83 | |
1da177e4 LT |
84 | extern struct Qdisc_ops pfifo_qdisc_ops; |
85 | extern struct Qdisc_ops bfifo_qdisc_ops; | |
57dbb2d8 | 86 | extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; |
1da177e4 | 87 | |
5c15257f JP |
88 | int fifo_set_limit(struct Qdisc *q, unsigned int limit); |
89 | struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, | |
90 | unsigned int limit); | |
91 | ||
92 | int register_qdisc(struct Qdisc_ops *qops); | |
93 | int unregister_qdisc(struct Qdisc_ops *qops); | |
6da7c8fc | 94 | void qdisc_get_default(char *id, size_t len); |
95 | int qdisc_set_default(const char *id); | |
96 | ||
49b49971 | 97 | void qdisc_hash_add(struct Qdisc *q, bool invisible); |
59cc1f61 | 98 | void qdisc_hash_del(struct Qdisc *q); |
5c15257f JP |
99 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); |
100 | struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); | |
101 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, | |
102 | struct nlattr *tab); | |
103 | void qdisc_put_rtab(struct qdisc_rate_table *tab); | |
104 | void qdisc_put_stab(struct qdisc_size_table *tab); | |
6e765a00 | 105 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); |
5c15257f JP |
106 | int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
107 | struct net_device *dev, struct netdev_queue *txq, | |
55a93b3e | 108 | spinlock_t *root_lock, bool validate); |
5c15257f JP |
109 | |
110 | void __qdisc_run(struct Qdisc *q); | |
1da177e4 | 111 | |
37437bb2 | 112 | static inline void qdisc_run(struct Qdisc *q) |
1da177e4 | 113 | { |
bc135b23 | 114 | if (qdisc_run_begin(q)) |
37437bb2 | 115 | __qdisc_run(q); |
1da177e4 LT |
116 | } |
117 | ||
d8b9605d JP |
118 | static inline __be16 tc_skb_protocol(const struct sk_buff *skb) |
119 | { | |
120 | /* We need to take extra care in case the skb came via | |
121 | * vlan accelerated path. In that case, use skb->vlan_proto | |
122 | * as the original vlan header was already stripped. | |
123 | */ | |
df8a39de | 124 | if (skb_vlan_tag_present(skb)) |
d8b9605d JP |
125 | return skb->vlan_proto; |
126 | return skb->protocol; | |
127 | } | |
128 | ||
1da177e4 LT |
129 | /* Calculate maximal size of packet seen by hard_start_xmit |
130 | routine of this device. | |
131 | */ | |
95c96174 | 132 | static inline unsigned int psched_mtu(const struct net_device *dev) |
1da177e4 | 133 | { |
3b04ddde | 134 | return dev->mtu + dev->hard_header_len; |
1da177e4 LT |
135 | } |
136 | ||
861932ec JP |
137 | static inline bool is_classid_clsact_ingress(u32 classid) |
138 | { | |
139 | /* This also returns true for ingress qdisc */ | |
140 | return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) && | |
141 | TC_H_MIN(classid) != TC_H_MIN(TC_H_MIN_EGRESS); | |
142 | } | |
143 | ||
144 | static inline bool is_classid_clsact_egress(u32 classid) | |
145 | { | |
146 | return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) && | |
147 | TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_EGRESS); | |
148 | } | |
149 | ||
1da177e4 | 150 | #endif |