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
16 struct qdisc_walker {
17 int stop;
18 int skip;
19 int count;
20 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
21 };
22
qdisc_priv(struct Qdisc * q)23 static inline void *qdisc_priv(struct Qdisc *q)
24 {
25 return &q->privdata;
26 }
27
28 /*
29 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
30
31 Normal IP packet size ~ 512byte, hence:
32
33 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
34 10Mbit ethernet.
35
36 10msec resolution -> <50Kbit/sec.
37
38 The result: [34]86 is not good choice for QoS router :-(
39
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.
43 */
44
45 typedef u64 psched_time_t;
46 typedef long psched_tdiff_t;
47
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)
52
53 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
54 #define PSCHED_PASTPERFECT 0
55
psched_get_time(void)56 static inline psched_time_t psched_get_time(void)
57 {
58 return PSCHED_NS2TICKS(ktime_get_ns());
59 }
60
61 static inline psched_tdiff_t
psched_tdiff_bounded(psched_time_t tv1,psched_time_t tv2,psched_time_t bound)62 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
63 {
64 return min(tv1 - tv2, bound);
65 }
66
67 struct qdisc_watchdog {
68 u64 last_expires;
69 struct hrtimer timer;
70 struct Qdisc *qdisc;
71 };
72
73 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
74 clockid_t clockid);
75 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
76
77 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
78 u64 delta_ns);
79
qdisc_watchdog_schedule_ns(struct qdisc_watchdog * wd,u64 expires)80 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
81 u64 expires)
82 {
83 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
84 }
85
qdisc_watchdog_schedule(struct qdisc_watchdog * wd,psched_time_t expires)86 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
87 psched_time_t expires)
88 {
89 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
90 }
91
92 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
93
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;
97
98 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
99 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
100 unsigned int limit,
101 struct netlink_ext_ack *extack);
102
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);
107
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,
113 struct nlattr *tab,
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);
121
122 void __qdisc_run(struct Qdisc *q);
123
qdisc_run(struct Qdisc * q)124 static inline void qdisc_run(struct Qdisc *q)
125 {
126 if (qdisc_run_begin(q)) {
127 __qdisc_run(q);
128 qdisc_run_end(q);
129 }
130 }
131
132 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
133
134 /* Calculate maximal size of packet seen by hard_start_xmit
135 routine of this device.
136 */
psched_mtu(const struct net_device * dev)137 static inline unsigned int psched_mtu(const struct net_device *dev)
138 {
139 return READ_ONCE(dev->mtu) + dev->hard_header_len;
140 }
141
qdisc_net(struct Qdisc * q)142 static inline struct net *qdisc_net(struct Qdisc *q)
143 {
144 return dev_net(q->dev_queue->dev);
145 }
146
147 struct tc_cbs_qopt_offload {
148 u8 enable;
149 s32 queue;
150 s32 hicredit;
151 s32 locredit;
152 s32 idleslope;
153 s32 sendslope;
154 };
155
156 struct tc_etf_qopt_offload {
157 u8 enable;
158 s32 queue;
159 };
160
161 struct tc_taprio_sched_entry {
162 u8 command; /* TC_TAPRIO_CMD_* */
163
164 /* The gate_mask in the offloading side refers to traffic classes */
165 u32 gate_mask;
166 u32 interval;
167 };
168
169 struct tc_taprio_qopt_offload {
170 u8 enable;
171 ktime_t base_time;
172 u64 cycle_time;
173 u64 cycle_time_extension;
174
175 size_t num_entries;
176 struct tc_taprio_sched_entry entries[];
177 };
178
179 /* Reference counting */
180 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
181 *offload);
182 void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
183
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.
187 */
skb_txtime_consumed(struct sk_buff * skb)188 static inline void skb_txtime_consumed(struct sk_buff *skb)
189 {
190 skb->tstamp = ktime_set(0, 0);
191 }
192
193 #endif
194