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
14 #define STAB_SIZE_LOG_MAX 30
20 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
23 static inline void *qdisc_priv(struct Qdisc *q)
29 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
31 Normal IP packet size ~ 512byte, hence:
33 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
36 10msec resolution -> <50Kbit/sec.
38 The result: [34]86 is not good choice for QoS router :-(
40 The things are not so bad, because we may use artificial
41 clock evaluated by integration of network data flow
42 in the most critical places.
45 typedef u64 psched_time_t;
46 typedef long psched_tdiff_t;
48 /* Avoid doing 64 bit divide */
49 #define PSCHED_SHIFT 6
50 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
51 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
53 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
54 #define PSCHED_PASTPERFECT 0
56 static inline psched_time_t psched_get_time(void)
58 return PSCHED_NS2TICKS(ktime_get_ns());
61 static inline psched_tdiff_t
62 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
64 return min(tv1 - tv2, bound);
67 struct qdisc_watchdog {
73 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
75 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
77 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
80 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
83 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
86 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
87 psched_time_t expires)
89 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
92 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
94 extern struct Qdisc_ops pfifo_qdisc_ops;
95 extern struct Qdisc_ops bfifo_qdisc_ops;
96 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
98 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
99 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
101 struct netlink_ext_ack *extack);
103 int register_qdisc(struct Qdisc_ops *qops);
104 int unregister_qdisc(struct Qdisc_ops *qops);
105 void qdisc_get_default(char *id, size_t len);
106 int qdisc_set_default(const char *id);
108 void qdisc_hash_add(struct Qdisc *q, bool invisible);
109 void qdisc_hash_del(struct Qdisc *q);
110 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
111 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
112 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
114 struct netlink_ext_ack *extack);
115 void qdisc_put_rtab(struct qdisc_rate_table *tab);
116 void qdisc_put_stab(struct qdisc_size_table *tab);
117 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
118 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
119 struct net_device *dev, struct netdev_queue *txq,
120 spinlock_t *root_lock, bool validate);
122 void __qdisc_run(struct Qdisc *q);
124 static inline void qdisc_run(struct Qdisc *q)
126 if (qdisc_run_begin(q)) {
132 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
134 /* Calculate maximal size of packet seen by hard_start_xmit
135 routine of this device.
137 static inline unsigned int psched_mtu(const struct net_device *dev)
139 return READ_ONCE(dev->mtu) + dev->hard_header_len;
142 static inline struct net *qdisc_net(struct Qdisc *q)
144 return dev_net(q->dev_queue->dev);
147 struct tc_cbs_qopt_offload {
156 struct tc_etf_qopt_offload {
161 struct tc_taprio_sched_entry {
162 u8 command; /* TC_TAPRIO_CMD_* */
164 /* The gate_mask in the offloading side refers to traffic classes */
169 struct tc_taprio_qopt_offload {
173 u64 cycle_time_extension;
176 struct tc_taprio_sched_entry entries[];
179 /* Reference counting */
180 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
182 void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
184 /* Ensure skb_mstamp_ns, which might have been populated with the txtime, is
185 * not mistaken for a software timestamp, because this will otherwise prevent
186 * the dispatch of hardware timestamps to the socket.
188 static inline void skb_txtime_consumed(struct sk_buff *skb)
190 skb->tstamp = ktime_set(0, 0);