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1#ifndef __NET_PKT_SCHED_H
2#define __NET_PKT_SCHED_H
3
4#include <linux/jiffies.h>
5#include <linux/ktime.h>
6#include <net/sch_generic.h>
7
8struct qdisc_walker {
9 int stop;
10 int skip;
11 int count;
12 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
13};
14
15#define QDISC_ALIGNTO 64
16#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
17
18static inline void *qdisc_priv(struct Qdisc *q)
19{
20 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
21}
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
35 The things are not so bad, because we may use artificial
36 clock evaluated by integration of network data flow
37 in the most critical places.
38 */
39
40typedef u64 psched_time_t;
41typedef long psched_tdiff_t;
42
43/* Avoid doing 64 bit divide */
44#define PSCHED_SHIFT 6
45#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
46#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
47
48#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
49#define PSCHED_PASTPERFECT 0
50
51static inline psched_time_t psched_get_time(void)
52{
53 return PSCHED_NS2TICKS(ktime_to_ns(ktime_get()));
54}
55
56static 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
62struct 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
72extern struct Qdisc_ops pfifo_qdisc_ops;
73extern struct Qdisc_ops bfifo_qdisc_ops;
74extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
75
76extern 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
80extern int register_qdisc(struct Qdisc_ops *qops);
81extern int unregister_qdisc(struct Qdisc_ops *qops);
82extern void qdisc_list_del(struct Qdisc *q);
83extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
84extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
85extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
86 struct nlattr *tab);
87extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
88extern void qdisc_put_stab(struct qdisc_size_table *tab);
89extern void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc);
90extern 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);
93
94extern void __qdisc_run(struct Qdisc *q);
95
96static inline void qdisc_run(struct Qdisc *q)
97{
98 if (qdisc_run_begin(q))
99 __qdisc_run(q);
100}
101
102extern int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
103 struct tcf_result *res);
104extern int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
105 struct tcf_result *res);
106
107/* Calculate maximal size of packet seen by hard_start_xmit
108 routine of this device.
109 */
110static inline unsigned psched_mtu(const struct net_device *dev)
111{
112 return dev->mtu + dev->hard_header_len;
113}
114
115#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NET_PKT_SCHED_H
3#define __NET_PKT_SCHED_H
4
5#include <linux/jiffies.h>
6#include <linux/ktime.h>
7#include <linux/if_vlan.h>
8#include <linux/netdevice.h>
9#include <net/sch_generic.h>
10#include <net/net_namespace.h>
11#include <uapi/linux/pkt_sched.h>
12
13#define DEFAULT_TX_QUEUE_LEN 1000
14
15struct qdisc_walker {
16 int stop;
17 int skip;
18 int count;
19 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
20};
21
22#define QDISC_ALIGNTO 64
23#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
24
25static inline void *qdisc_priv(struct Qdisc *q)
26{
27 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
28}
29
30/*
31 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
32
33 Normal IP packet size ~ 512byte, hence:
34
35 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
36 10Mbit ethernet.
37
38 10msec resolution -> <50Kbit/sec.
39
40 The result: [34]86 is not good choice for QoS router :-(
41
42 The things are not so bad, because we may use artificial
43 clock evaluated by integration of network data flow
44 in the most critical places.
45 */
46
47typedef u64 psched_time_t;
48typedef long psched_tdiff_t;
49
50/* Avoid doing 64 bit divide */
51#define PSCHED_SHIFT 6
52#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
53#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
54
55#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
56#define PSCHED_PASTPERFECT 0
57
58static inline psched_time_t psched_get_time(void)
59{
60 return PSCHED_NS2TICKS(ktime_get_ns());
61}
62
63static inline psched_tdiff_t
64psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
65{
66 return min(tv1 - tv2, bound);
67}
68
69struct qdisc_watchdog {
70 u64 last_expires;
71 struct hrtimer timer;
72 struct Qdisc *qdisc;
73};
74
75void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
76 clockid_t clockid);
77void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
78void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
79
80static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
81 psched_time_t expires)
82{
83 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
84}
85
86void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
87
88extern struct Qdisc_ops pfifo_qdisc_ops;
89extern struct Qdisc_ops bfifo_qdisc_ops;
90extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
91
92int fifo_set_limit(struct Qdisc *q, unsigned int limit);
93struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
94 unsigned int limit,
95 struct netlink_ext_ack *extack);
96
97int register_qdisc(struct Qdisc_ops *qops);
98int unregister_qdisc(struct Qdisc_ops *qops);
99void qdisc_get_default(char *id, size_t len);
100int qdisc_set_default(const char *id);
101
102void qdisc_hash_add(struct Qdisc *q, bool invisible);
103void qdisc_hash_del(struct Qdisc *q);
104struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
105struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
106struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
107 struct nlattr *tab,
108 struct netlink_ext_ack *extack);
109void qdisc_put_rtab(struct qdisc_rate_table *tab);
110void qdisc_put_stab(struct qdisc_size_table *tab);
111void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
112bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
113 struct net_device *dev, struct netdev_queue *txq,
114 spinlock_t *root_lock, bool validate);
115
116void __qdisc_run(struct Qdisc *q);
117
118static inline void qdisc_run(struct Qdisc *q)
119{
120 if (qdisc_run_begin(q)) {
121 /* NOLOCK qdisc must check 'state' under the qdisc seqlock
122 * to avoid racing with dev_qdisc_reset()
123 */
124 if (!(q->flags & TCQ_F_NOLOCK) ||
125 likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
126 __qdisc_run(q);
127 qdisc_run_end(q);
128 }
129}
130
131static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
132{
133 /* We need to take extra care in case the skb came via
134 * vlan accelerated path. In that case, use skb->vlan_proto
135 * as the original vlan header was already stripped.
136 */
137 if (skb_vlan_tag_present(skb))
138 return skb->vlan_proto;
139 return skb->protocol;
140}
141
142/* Calculate maximal size of packet seen by hard_start_xmit
143 routine of this device.
144 */
145static inline unsigned int psched_mtu(const struct net_device *dev)
146{
147 return dev->mtu + dev->hard_header_len;
148}
149
150static inline struct net *qdisc_net(struct Qdisc *q)
151{
152 return dev_net(q->dev_queue->dev);
153}
154
155struct tc_cbs_qopt_offload {
156 u8 enable;
157 s32 queue;
158 s32 hicredit;
159 s32 locredit;
160 s32 idleslope;
161 s32 sendslope;
162};
163
164struct tc_etf_qopt_offload {
165 u8 enable;
166 s32 queue;
167};
168
169struct tc_taprio_sched_entry {
170 u8 command; /* TC_TAPRIO_CMD_* */
171
172 /* The gate_mask in the offloading side refers to traffic classes */
173 u32 gate_mask;
174 u32 interval;
175};
176
177struct tc_taprio_qopt_offload {
178 u8 enable;
179 ktime_t base_time;
180 u64 cycle_time;
181 u64 cycle_time_extension;
182
183 size_t num_entries;
184 struct tc_taprio_sched_entry entries[0];
185};
186
187/* Reference counting */
188struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
189 *offload);
190void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
191
192#endif