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 
qdisc_from_priv(void * priv)28 static inline struct Qdisc *qdisc_from_priv(void *priv)
29 {
30 	return container_of(priv, struct Qdisc, privdata);
31 }
32 
33 /*
34    Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
35 
36    Normal IP packet size ~ 512byte, hence:
37 
38    0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
39    10Mbit ethernet.
40 
41    10msec resolution -> <50Kbit/sec.
42 
43    The result: [34]86 is not good choice for QoS router :-(
44 
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.
48  */
49 
50 typedef u64	psched_time_t;
51 typedef long	psched_tdiff_t;
52 
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)
57 
58 #define PSCHED_TICKS_PER_SEC		PSCHED_NS2TICKS(NSEC_PER_SEC)
59 #define PSCHED_PASTPERFECT		0
60 
psched_get_time(void)61 static inline psched_time_t psched_get_time(void)
62 {
63 	return PSCHED_NS2TICKS(ktime_get_ns());
64 }
65 
66 static inline psched_tdiff_t
psched_tdiff_bounded(psched_time_t tv1,psched_time_t tv2,psched_time_t bound)67 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
68 {
69 	return min(tv1 - tv2, bound);
70 }
71 
72 struct qdisc_watchdog {
73 	u64		last_expires;
74 	struct hrtimer	timer;
75 	struct Qdisc	*qdisc;
76 };
77 
78 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
79 				 clockid_t clockid);
80 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
81 
82 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
83 				      u64 delta_ns);
84 
qdisc_watchdog_schedule_ns(struct qdisc_watchdog * wd,u64 expires)85 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
86 					      u64 expires)
87 {
88 	return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
89 }
90 
qdisc_watchdog_schedule(struct qdisc_watchdog * wd,psched_time_t expires)91 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
92 					   psched_time_t expires)
93 {
94 	qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
95 }
96 
97 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
98 
99 extern struct Qdisc_ops pfifo_qdisc_ops;
100 extern struct Qdisc_ops bfifo_qdisc_ops;
101 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
102 
103 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
104 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
105 			       unsigned int limit,
106 			       struct netlink_ext_ack *extack);
107 
108 int register_qdisc(struct Qdisc_ops *qops);
109 int unregister_qdisc(struct Qdisc_ops *qops);
110 void qdisc_get_default(char *id, size_t len);
111 int qdisc_set_default(const char *id);
112 
113 void qdisc_hash_add(struct Qdisc *q, bool invisible);
114 void qdisc_hash_del(struct Qdisc *q);
115 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
116 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
117 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
118 					struct nlattr *tab,
119 					struct netlink_ext_ack *extack);
120 void qdisc_put_rtab(struct qdisc_rate_table *tab);
121 void qdisc_put_stab(struct qdisc_size_table *tab);
122 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
123 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
124 		     struct net_device *dev, struct netdev_queue *txq,
125 		     spinlock_t *root_lock, bool validate);
126 
127 void __qdisc_run(struct Qdisc *q);
128 
qdisc_run(struct Qdisc * q)129 static inline void qdisc_run(struct Qdisc *q)
130 {
131 	if (qdisc_run_begin(q)) {
132 		__qdisc_run(q);
133 		qdisc_run_end(q);
134 	}
135 }
136 
137 /* Calculate maximal size of packet seen by hard_start_xmit
138    routine of this device.
139  */
psched_mtu(const struct net_device * dev)140 static inline unsigned int psched_mtu(const struct net_device *dev)
141 {
142 	return dev->mtu + dev->hard_header_len;
143 }
144 
qdisc_net(struct Qdisc * q)145 static inline struct net *qdisc_net(struct Qdisc *q)
146 {
147 	return dev_net(q->dev_queue->dev);
148 }
149 
150 struct tc_cbs_qopt_offload {
151 	u8 enable;
152 	s32 queue;
153 	s32 hicredit;
154 	s32 locredit;
155 	s32 idleslope;
156 	s32 sendslope;
157 };
158 
159 struct tc_etf_qopt_offload {
160 	u8 enable;
161 	s32 queue;
162 };
163 
164 struct tc_taprio_sched_entry {
165 	u8 command; /* TC_TAPRIO_CMD_* */
166 
167 	/* The gate_mask in the offloading side refers to traffic classes */
168 	u32 gate_mask;
169 	u32 interval;
170 };
171 
172 struct tc_taprio_qopt_offload {
173 	u8 enable;
174 	ktime_t base_time;
175 	u64 cycle_time;
176 	u64 cycle_time_extension;
177 
178 	size_t num_entries;
179 	struct tc_taprio_sched_entry entries[];
180 };
181 
182 /* Reference counting */
183 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
184 						  *offload);
185 void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
186 
187 /* Ensure skb_mstamp_ns, which might have been populated with the txtime, is
188  * not mistaken for a software timestamp, because this will otherwise prevent
189  * the dispatch of hardware timestamps to the socket.
190  */
skb_txtime_consumed(struct sk_buff * skb)191 static inline void skb_txtime_consumed(struct sk_buff *skb)
192 {
193 	skb->tstamp = ktime_set(0, 0);
194 }
195 
196 struct tc_skb_cb {
197 	struct qdisc_skb_cb qdisc_cb;
198 
199 	u16 mru;
200 	bool post_ct;
201 	u16 zone; /* Only valid if post_ct = true */
202 };
203 
tc_skb_cb(const struct sk_buff * skb)204 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
205 {
206 	struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
207 
208 	BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
209 	return cb;
210 }
211 
212 #endif
213