xref: /openbmc/linux/include/net/pkt_sched.h (revision 6aa7de05)
1 #ifndef __NET_PKT_SCHED_H
2 #define __NET_PKT_SCHED_H
3 
4 #include <linux/jiffies.h>
5 #include <linux/ktime.h>
6 #include <linux/if_vlan.h>
7 #include <net/sch_generic.h>
8 #include <uapi/linux/pkt_sched.h>
9 
10 #define DEFAULT_TX_QUEUE_LEN	1000
11 
12 struct qdisc_walker {
13 	int	stop;
14 	int	skip;
15 	int	count;
16 	int	(*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
17 };
18 
19 #define QDISC_ALIGNTO		64
20 #define QDISC_ALIGN(len)	(((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
21 
22 static inline void *qdisc_priv(struct Qdisc *q)
23 {
24 	return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
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 
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
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(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
73 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
74 
75 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
76 					   psched_time_t expires)
77 {
78 	qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
79 }
80 
81 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
82 
83 extern struct Qdisc_ops pfifo_qdisc_ops;
84 extern struct Qdisc_ops bfifo_qdisc_ops;
85 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
86 
87 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
88 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
89 			       unsigned int limit);
90 
91 int register_qdisc(struct Qdisc_ops *qops);
92 int unregister_qdisc(struct Qdisc_ops *qops);
93 void qdisc_get_default(char *id, size_t len);
94 int qdisc_set_default(const char *id);
95 
96 void qdisc_hash_add(struct Qdisc *q, bool invisible);
97 void qdisc_hash_del(struct Qdisc *q);
98 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
99 struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
100 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
101 					struct nlattr *tab);
102 void qdisc_put_rtab(struct qdisc_rate_table *tab);
103 void qdisc_put_stab(struct qdisc_size_table *tab);
104 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
105 int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
106 		    struct net_device *dev, struct netdev_queue *txq,
107 		    spinlock_t *root_lock, bool validate);
108 
109 void __qdisc_run(struct Qdisc *q);
110 
111 static inline void qdisc_run(struct Qdisc *q)
112 {
113 	if (qdisc_run_begin(q))
114 		__qdisc_run(q);
115 }
116 
117 static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
118 {
119 	/* We need to take extra care in case the skb came via
120 	 * vlan accelerated path. In that case, use skb->vlan_proto
121 	 * as the original vlan header was already stripped.
122 	 */
123 	if (skb_vlan_tag_present(skb))
124 		return skb->vlan_proto;
125 	return skb->protocol;
126 }
127 
128 /* Calculate maximal size of packet seen by hard_start_xmit
129    routine of this device.
130  */
131 static inline unsigned int psched_mtu(const struct net_device *dev)
132 {
133 	return dev->mtu + dev->hard_header_len;
134 }
135 
136 static inline bool is_classid_clsact_ingress(u32 classid)
137 {
138 	/* This also returns true for ingress qdisc */
139 	return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) &&
140 	       TC_H_MIN(classid) != TC_H_MIN(TC_H_MIN_EGRESS);
141 }
142 
143 static inline bool is_classid_clsact_egress(u32 classid)
144 {
145 	return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) &&
146 	       TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_EGRESS);
147 }
148 
149 #endif
150