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
15 struct qdisc_walker {
16 int stop;
17 int skip;
18 int count;
19 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
20 };
21
qdisc_priv(struct Qdisc * q)22 static inline void *qdisc_priv(struct Qdisc *q)
23 {
24 return &q->privdata;
25 }
26
27 /*
28 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
29
30 Normal IP packet size ~ 512byte, hence:
31
32 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
33 10Mbit ethernet.
34
35 10msec resolution -> <50Kbit/sec.
36
37 The result: [34]86 is not good choice for QoS router :-(
38
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.
42 */
43
44 typedef u64 psched_time_t;
45 typedef long psched_tdiff_t;
46
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)
51
52 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
53 #define PSCHED_PASTPERFECT 0
54
psched_get_time(void)55 static inline psched_time_t psched_get_time(void)
56 {
57 return PSCHED_NS2TICKS(ktime_get_ns());
58 }
59
60 static inline psched_tdiff_t
psched_tdiff_bounded(psched_time_t tv1,psched_time_t tv2,psched_time_t bound)61 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
62 {
63 return min(tv1 - tv2, bound);
64 }
65
66 struct qdisc_watchdog {
67 u64 last_expires;
68 struct hrtimer timer;
69 struct Qdisc *qdisc;
70 };
71
72 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
73 clockid_t clockid);
74 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
75
76 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
77 u64 delta_ns);
78
qdisc_watchdog_schedule_ns(struct qdisc_watchdog * wd,u64 expires)79 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
80 u64 expires)
81 {
82 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
83 }
84
qdisc_watchdog_schedule(struct qdisc_watchdog * wd,psched_time_t expires)85 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
86 psched_time_t expires)
87 {
88 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
89 }
90
91 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
92
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;
96
97 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
98 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
99 unsigned int limit,
100 struct netlink_ext_ack *extack);
101
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);
106
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,
112 struct nlattr *tab,
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);
120
121 void __qdisc_run(struct Qdisc *q);
122
qdisc_run(struct Qdisc * q)123 static inline void qdisc_run(struct Qdisc *q)
124 {
125 if (qdisc_run_begin(q)) {
126 /* NOLOCK qdisc must check 'state' under the qdisc seqlock
127 * to avoid racing with dev_qdisc_reset()
128 */
129 if (!(q->flags & TCQ_F_NOLOCK) ||
130 likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
131 __qdisc_run(q);
132 qdisc_run_end(q);
133 }
134 }
135
136 /* Calculate maximal size of packet seen by hard_start_xmit
137 routine of this device.
138 */
psched_mtu(const struct net_device * dev)139 static inline unsigned int psched_mtu(const struct net_device *dev)
140 {
141 return dev->mtu + dev->hard_header_len;
142 }
143
qdisc_net(struct Qdisc * q)144 static inline struct net *qdisc_net(struct Qdisc *q)
145 {
146 return dev_net(q->dev_queue->dev);
147 }
148
149 struct tc_cbs_qopt_offload {
150 u8 enable;
151 s32 queue;
152 s32 hicredit;
153 s32 locredit;
154 s32 idleslope;
155 s32 sendslope;
156 };
157
158 struct tc_etf_qopt_offload {
159 u8 enable;
160 s32 queue;
161 };
162
163 struct tc_taprio_sched_entry {
164 u8 command; /* TC_TAPRIO_CMD_* */
165
166 /* The gate_mask in the offloading side refers to traffic classes */
167 u32 gate_mask;
168 u32 interval;
169 };
170
171 struct tc_taprio_qopt_offload {
172 u8 enable;
173 ktime_t base_time;
174 u64 cycle_time;
175 u64 cycle_time_extension;
176
177 size_t num_entries;
178 struct tc_taprio_sched_entry entries[];
179 };
180
181 /* Reference counting */
182 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
183 *offload);
184 void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
185
186 #endif
187
