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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 <linux/if_vlan.h>
7#include <net/sch_generic.h>
8
9struct qdisc_walker {
10 int stop;
11 int skip;
12 int count;
13 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
14};
15
16#define QDISC_ALIGNTO 64
17#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
18
19static inline void *qdisc_priv(struct Qdisc *q)
20{
21 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
22}
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
36 The things are not so bad, because we may use artificial
37 clock evaluated by integration of network data flow
38 in the most critical places.
39 */
40
41typedef u64 psched_time_t;
42typedef long psched_tdiff_t;
43
44/* Avoid doing 64 bit divide */
45#define PSCHED_SHIFT 6
46#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
47#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
48
49#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
50#define PSCHED_PASTPERFECT 0
51
52static inline psched_time_t psched_get_time(void)
53{
54 return PSCHED_NS2TICKS(ktime_get_ns());
55}
56
57static 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
63struct qdisc_watchdog {
64 struct hrtimer timer;
65 struct Qdisc *qdisc;
66};
67
68void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
69void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle);
70
71static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
72 psched_time_t expires)
73{
74 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires), true);
75}
76
77void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
78
79extern struct Qdisc_ops pfifo_qdisc_ops;
80extern struct Qdisc_ops bfifo_qdisc_ops;
81extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
82
83int fifo_set_limit(struct Qdisc *q, unsigned int limit);
84struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
85 unsigned int limit);
86
87int register_qdisc(struct Qdisc_ops *qops);
88int unregister_qdisc(struct Qdisc_ops *qops);
89void qdisc_get_default(char *id, size_t len);
90int qdisc_set_default(const char *id);
91
92void qdisc_list_add(struct Qdisc *q);
93void qdisc_list_del(struct Qdisc *q);
94struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
95struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
96struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
97 struct nlattr *tab);
98void qdisc_put_rtab(struct qdisc_rate_table *tab);
99void qdisc_put_stab(struct qdisc_size_table *tab);
100void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
101int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
102 struct net_device *dev, struct netdev_queue *txq,
103 spinlock_t *root_lock, bool validate);
104
105void __qdisc_run(struct Qdisc *q);
106
107static inline void qdisc_run(struct Qdisc *q)
108{
109 if (qdisc_run_begin(q))
110 __qdisc_run(q);
111}
112
113int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
114 struct tcf_result *res, bool compat_mode);
115
116static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
117{
118 /* We need to take extra care in case the skb came via
119 * vlan accelerated path. In that case, use skb->vlan_proto
120 * as the original vlan header was already stripped.
121 */
122 if (skb_vlan_tag_present(skb))
123 return skb->vlan_proto;
124 return skb->protocol;
125}
126
127/* Calculate maximal size of packet seen by hard_start_xmit
128 routine of this device.
129 */
130static inline unsigned int psched_mtu(const struct net_device *dev)
131{
132 return dev->mtu + dev->hard_header_len;
133}
134
135#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#define STAB_SIZE_LOG_MAX 30
15
16struct qdisc_walker {
17 int stop;
18 int skip;
19 int count;
20 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
21};
22
23static inline void *qdisc_priv(struct Qdisc *q)
24{
25 return &q->privdata;
26}
27
28static inline struct Qdisc *qdisc_from_priv(void *priv)
29{
30 return container_of(priv, struct Qdisc, privdata);
31}
32
33/*
34 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
35
36 Normal IP packet size ~ 512byte, hence:
37
38 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
39 10Mbit ethernet.
40
41 10msec resolution -> <50Kbit/sec.
42
43 The result: [34]86 is not good choice for QoS router :-(
44
45 The things are not so bad, because we may use artificial
46 clock evaluated by integration of network data flow
47 in the most critical places.
48 */
49
50typedef u64 psched_time_t;
51typedef long psched_tdiff_t;
52
53/* Avoid doing 64 bit divide */
54#define PSCHED_SHIFT 6
55#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
56#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
57
58#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
59#define PSCHED_PASTPERFECT 0
60
61static inline psched_time_t psched_get_time(void)
62{
63 return PSCHED_NS2TICKS(ktime_get_ns());
64}
65
66static inline psched_tdiff_t
67psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
68{
69 return min(tv1 - tv2, bound);
70}
71
72struct qdisc_watchdog {
73 u64 last_expires;
74 struct hrtimer timer;
75 struct Qdisc *qdisc;
76};
77
78void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
79 clockid_t clockid);
80void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
81
82void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
83 u64 delta_ns);
84
85static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
86 u64 expires)
87{
88 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
89}
90
91static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
92 psched_time_t expires)
93{
94 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
95}
96
97void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
98
99extern struct Qdisc_ops pfifo_qdisc_ops;
100extern struct Qdisc_ops bfifo_qdisc_ops;
101extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
102
103int fifo_set_limit(struct Qdisc *q, unsigned int limit);
104struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
105 unsigned int limit,
106 struct netlink_ext_ack *extack);
107
108int register_qdisc(struct Qdisc_ops *qops);
109int unregister_qdisc(struct Qdisc_ops *qops);
110void qdisc_get_default(char *id, size_t len);
111int qdisc_set_default(const char *id);
112
113void qdisc_hash_add(struct Qdisc *q, bool invisible);
114void qdisc_hash_del(struct Qdisc *q);
115struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
116struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
117struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
118 struct nlattr *tab,
119 struct netlink_ext_ack *extack);
120void qdisc_put_rtab(struct qdisc_rate_table *tab);
121void qdisc_put_stab(struct qdisc_size_table *tab);
122void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
123bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
124 struct net_device *dev, struct netdev_queue *txq,
125 spinlock_t *root_lock, bool validate);
126
127void __qdisc_run(struct Qdisc *q);
128
129static inline void qdisc_run(struct Qdisc *q)
130{
131 if (qdisc_run_begin(q)) {
132 __qdisc_run(q);
133 qdisc_run_end(q);
134 }
135}
136
137/* Calculate maximal size of packet seen by hard_start_xmit
138 routine of this device.
139 */
140static inline unsigned int psched_mtu(const struct net_device *dev)
141{
142 return dev->mtu + dev->hard_header_len;
143}
144
145static inline struct net *qdisc_net(struct Qdisc *q)
146{
147 return dev_net(q->dev_queue->dev);
148}
149
150struct tc_cbs_qopt_offload {
151 u8 enable;
152 s32 queue;
153 s32 hicredit;
154 s32 locredit;
155 s32 idleslope;
156 s32 sendslope;
157};
158
159struct tc_etf_qopt_offload {
160 u8 enable;
161 s32 queue;
162};
163
164struct tc_taprio_sched_entry {
165 u8 command; /* TC_TAPRIO_CMD_* */
166
167 /* The gate_mask in the offloading side refers to traffic classes */
168 u32 gate_mask;
169 u32 interval;
170};
171
172struct tc_taprio_qopt_offload {
173 u8 enable;
174 ktime_t base_time;
175 u64 cycle_time;
176 u64 cycle_time_extension;
177
178 size_t num_entries;
179 struct tc_taprio_sched_entry entries[];
180};
181
182/* Reference counting */
183struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
184 *offload);
185void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
186
187/* Ensure skb_mstamp_ns, which might have been populated with the txtime, is
188 * not mistaken for a software timestamp, because this will otherwise prevent
189 * the dispatch of hardware timestamps to the socket.
190 */
191static inline void skb_txtime_consumed(struct sk_buff *skb)
192{
193 skb->tstamp = ktime_set(0, 0);
194}
195
196#endif