1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_PKT_SCHED_H
3 #define __NET_PKT_SCHED_H
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>
13 #define DEFAULT_TX_QUEUE_LEN 1000
19 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
22 static inline void *qdisc_priv(struct Qdisc *q)
28 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
30 Normal IP packet size ~ 512byte, hence:
32 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
35 10msec resolution -> <50Kbit/sec.
37 The result: [34]86 is not good choice for QoS router :-(
39 The things are not so bad, because we may use artificial
40 clock evaluated by integration of network data flow
41 in the most critical places.
44 typedef u64 psched_time_t;
45 typedef long psched_tdiff_t;
47 /* Avoid doing 64 bit divide */
48 #define PSCHED_SHIFT 6
49 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
50 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
52 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
53 #define PSCHED_PASTPERFECT 0
55 static inline psched_time_t psched_get_time(void)
57 return PSCHED_NS2TICKS(ktime_get_ns());
60 static inline psched_tdiff_t
61 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
63 return min(tv1 - tv2, bound);
66 struct qdisc_watchdog {
72 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
74 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
76 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
79 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
82 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
85 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
86 psched_time_t expires)
88 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
91 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
93 extern struct Qdisc_ops pfifo_qdisc_ops;
94 extern struct Qdisc_ops bfifo_qdisc_ops;
95 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
97 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
98 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
100 struct netlink_ext_ack *extack);
102 int register_qdisc(struct Qdisc_ops *qops);
103 int unregister_qdisc(struct Qdisc_ops *qops);
104 void qdisc_get_default(char *id, size_t len);
105 int qdisc_set_default(const char *id);
107 void qdisc_hash_add(struct Qdisc *q, bool invisible);
108 void qdisc_hash_del(struct Qdisc *q);
109 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
110 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
111 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
113 struct netlink_ext_ack *extack);
114 void qdisc_put_rtab(struct qdisc_rate_table *tab);
115 void qdisc_put_stab(struct qdisc_size_table *tab);
116 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
117 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
118 struct net_device *dev, struct netdev_queue *txq,
119 spinlock_t *root_lock, bool validate);
121 void __qdisc_run(struct Qdisc *q);
123 static inline void qdisc_run(struct Qdisc *q)
125 if (qdisc_run_begin(q)) {
126 /* NOLOCK qdisc must check 'state' under the qdisc seqlock
127 * to avoid racing with dev_qdisc_reset()
129 if (!(q->flags & TCQ_F_NOLOCK) ||
130 likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
136 /* Calculate maximal size of packet seen by hard_start_xmit
137 routine of this device.
139 static inline unsigned int psched_mtu(const struct net_device *dev)
141 return dev->mtu + dev->hard_header_len;
144 static inline struct net *qdisc_net(struct Qdisc *q)
146 return dev_net(q->dev_queue->dev);
149 struct tc_cbs_qopt_offload {
158 struct tc_etf_qopt_offload {
163 struct tc_taprio_sched_entry {
164 u8 command; /* TC_TAPRIO_CMD_* */
166 /* The gate_mask in the offloading side refers to traffic classes */
171 struct tc_taprio_qopt_offload {
175 u64 cycle_time_extension;
178 struct tc_taprio_sched_entry entries[];
181 /* Reference counting */
182 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
184 void taprio_offload_free(struct tc_taprio_qopt_offload *offload);