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
22 #define QDISC_ALIGNTO 64
23 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
24
qdisc_priv(struct Qdisc * q)25 static inline void *qdisc_priv(struct Qdisc *q)
26 {
27 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
28 }
29
30 /*
31 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
32
33 Normal IP packet size ~ 512byte, hence:
34
35 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
36 10Mbit ethernet.
37
38 10msec resolution -> <50Kbit/sec.
39
40 The result: [34]86 is not good choice for QoS router :-(
41
42 The things are not so bad, because we may use artificial
43 clock evaluated by integration of network data flow
44 in the most critical places.
45 */
46
47 typedef u64 psched_time_t;
48 typedef long psched_tdiff_t;
49
50 /* Avoid doing 64 bit divide */
51 #define PSCHED_SHIFT 6
52 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
53 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
54
55 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
56 #define PSCHED_PASTPERFECT 0
57
psched_get_time(void)58 static inline psched_time_t psched_get_time(void)
59 {
60 return PSCHED_NS2TICKS(ktime_get_ns());
61 }
62
63 static inline psched_tdiff_t
psched_tdiff_bounded(psched_time_t tv1,psched_time_t tv2,psched_time_t bound)64 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
65 {
66 return min(tv1 - tv2, bound);
67 }
68
69 struct qdisc_watchdog {
70 u64 last_expires;
71 struct hrtimer timer;
72 struct Qdisc *qdisc;
73 };
74
75 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
76 clockid_t clockid);
77 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
78 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
79
qdisc_watchdog_schedule(struct qdisc_watchdog * wd,psched_time_t expires)80 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
81 psched_time_t expires)
82 {
83 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
84 }
85
86 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
87
88 extern struct Qdisc_ops pfifo_qdisc_ops;
89 extern struct Qdisc_ops bfifo_qdisc_ops;
90 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
91
92 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
93 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
94 unsigned int limit,
95 struct netlink_ext_ack *extack);
96
97 int register_qdisc(struct Qdisc_ops *qops);
98 int unregister_qdisc(struct Qdisc_ops *qops);
99 void qdisc_get_default(char *id, size_t len);
100 int qdisc_set_default(const char *id);
101
102 void qdisc_hash_add(struct Qdisc *q, bool invisible);
103 void qdisc_hash_del(struct Qdisc *q);
104 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
105 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
106 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
107 struct nlattr *tab,
108 struct netlink_ext_ack *extack);
109 void qdisc_put_rtab(struct qdisc_rate_table *tab);
110 void qdisc_put_stab(struct qdisc_size_table *tab);
111 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
112 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
113 struct net_device *dev, struct netdev_queue *txq,
114 spinlock_t *root_lock, bool validate);
115
116 void __qdisc_run(struct Qdisc *q);
117
qdisc_run(struct Qdisc * q)118 static inline void qdisc_run(struct Qdisc *q)
119 {
120 if (qdisc_run_begin(q)) {
121 /* NOLOCK qdisc must check 'state' under the qdisc seqlock
122 * to avoid racing with dev_qdisc_reset()
123 */
124 if (!(q->flags & TCQ_F_NOLOCK) ||
125 likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
126 __qdisc_run(q);
127 qdisc_run_end(q);
128 }
129 }
130
tc_skb_protocol(const struct sk_buff * skb)131 static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
132 {
133 /* We need to take extra care in case the skb came via
134 * vlan accelerated path. In that case, use skb->vlan_proto
135 * as the original vlan header was already stripped.
136 */
137 if (skb_vlan_tag_present(skb))
138 return skb->vlan_proto;
139 return skb->protocol;
140 }
141
142 /* Calculate maximal size of packet seen by hard_start_xmit
143 routine of this device.
144 */
psched_mtu(const struct net_device * dev)145 static inline unsigned int psched_mtu(const struct net_device *dev)
146 {
147 return dev->mtu + dev->hard_header_len;
148 }
149
qdisc_net(struct Qdisc * q)150 static inline struct net *qdisc_net(struct Qdisc *q)
151 {
152 return dev_net(q->dev_queue->dev);
153 }
154
155 struct tc_cbs_qopt_offload {
156 u8 enable;
157 s32 queue;
158 s32 hicredit;
159 s32 locredit;
160 s32 idleslope;
161 s32 sendslope;
162 };
163
164 struct tc_etf_qopt_offload {
165 u8 enable;
166 s32 queue;
167 };
168
169 struct tc_taprio_sched_entry {
170 u8 command; /* TC_TAPRIO_CMD_* */
171
172 /* The gate_mask in the offloading side refers to traffic classes */
173 u32 gate_mask;
174 u32 interval;
175 };
176
177 struct tc_taprio_qopt_offload {
178 u8 enable;
179 ktime_t base_time;
180 u64 cycle_time;
181 u64 cycle_time_extension;
182
183 size_t num_entries;
184 struct tc_taprio_sched_entry entries[0];
185 };
186
187 /* Reference counting */
188 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
189 *offload);
190 void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
191
192 #endif
193
