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)
28 static inline struct Qdisc *qdisc_from_priv(void *priv)
30 return container_of(priv, struct Qdisc, privdata);
34 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
36 Normal IP packet size ~ 512byte, hence:
38 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
41 10msec resolution -> <50Kbit/sec.
43 The result: [34]86 is not good choice for QoS router :-(
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.
50 typedef u64 psched_time_t;
51 typedef long psched_tdiff_t;
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)
58 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
59 #define PSCHED_PASTPERFECT 0
61 static inline psched_time_t psched_get_time(void)
63 return PSCHED_NS2TICKS(ktime_get_ns());
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)) {
131 /* Calculate maximal size of packet seen by hard_start_xmit
132 routine of this device.
134 static inline unsigned int psched_mtu(const struct net_device *dev)
136 return dev->mtu + dev->hard_header_len;
139 static inline struct net *qdisc_net(struct Qdisc *q)
141 return dev_net(q->dev_queue->dev);
144 struct tc_cbs_qopt_offload {
153 struct tc_etf_qopt_offload {
158 struct tc_taprio_sched_entry {
159 u8 command; /* TC_TAPRIO_CMD_* */
161 /* The gate_mask in the offloading side refers to traffic classes */
166 struct tc_taprio_qopt_offload {
170 u64 cycle_time_extension;
173 struct tc_taprio_sched_entry entries[];
176 /* Reference counting */
177 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
179 void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
181 /* Ensure skb_mstamp_ns, which might have been populated with the txtime, is
182 * not mistaken for a software timestamp, because this will otherwise prevent
183 * the dispatch of hardware timestamps to the socket.
185 static inline void skb_txtime_consumed(struct sk_buff *skb)
187 skb->tstamp = ktime_set(0, 0);
191 struct qdisc_skb_cb qdisc_cb;
197 u16 zone; /* Only valid if post_ct = true */
200 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
202 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
204 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));