1 #ifndef __NET_PKT_SCHED_H
2 #define __NET_PKT_SCHED_H
4 #include <linux/jiffies.h>
5 #include <linux/ktime.h>
6 #include <net/sch_generic.h>
12 int (*fn
)(struct Qdisc
*, unsigned long cl
, struct qdisc_walker
*);
15 #define QDISC_ALIGNTO 64
16 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
18 static inline void *qdisc_priv(struct Qdisc
*q
)
20 return (char *) q
+ QDISC_ALIGN(sizeof(struct Qdisc
));
24 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
26 Normal IP packet size ~ 512byte, hence:
28 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
31 10msec resolution -> <50Kbit/sec.
33 The result: [34]86 is not good choice for QoS router :-(
35 The things are not so bad, because we may use artificial
36 clock evaluated by integration of network data flow
37 in the most critical places.
40 typedef u64 psched_time_t
;
41 typedef long psched_tdiff_t
;
43 /* Avoid doing 64 bit divide */
44 #define PSCHED_SHIFT 6
45 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
46 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
48 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
49 #define PSCHED_PASTPERFECT 0
51 static inline psched_time_t
psched_get_time(void)
53 return PSCHED_NS2TICKS(ktime_to_ns(ktime_get()));
56 static inline psched_tdiff_t
57 psched_tdiff_bounded(psched_time_t tv1
, psched_time_t tv2
, psched_time_t bound
)
59 return min(tv1
- tv2
, bound
);
62 struct qdisc_watchdog
{
67 void qdisc_watchdog_init(struct qdisc_watchdog
*wd
, struct Qdisc
*qdisc
);
68 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog
*wd
, u64 expires
);
70 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog
*wd
,
71 psched_time_t expires
)
73 qdisc_watchdog_schedule_ns(wd
, PSCHED_TICKS2NS(expires
));
76 void qdisc_watchdog_cancel(struct qdisc_watchdog
*wd
);
78 extern struct Qdisc_ops pfifo_qdisc_ops
;
79 extern struct Qdisc_ops bfifo_qdisc_ops
;
80 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops
;
82 int fifo_set_limit(struct Qdisc
*q
, unsigned int limit
);
83 struct Qdisc
*fifo_create_dflt(struct Qdisc
*sch
, struct Qdisc_ops
*ops
,
86 int register_qdisc(struct Qdisc_ops
*qops
);
87 int unregister_qdisc(struct Qdisc_ops
*qops
);
88 void qdisc_get_default(char *id
, size_t len
);
89 int qdisc_set_default(const char *id
);
91 void qdisc_list_del(struct Qdisc
*q
);
92 struct Qdisc
*qdisc_lookup(struct net_device
*dev
, u32 handle
);
93 struct Qdisc
*qdisc_lookup_class(struct net_device
*dev
, u32 handle
);
94 struct qdisc_rate_table
*qdisc_get_rtab(struct tc_ratespec
*r
,
96 void qdisc_put_rtab(struct qdisc_rate_table
*tab
);
97 void qdisc_put_stab(struct qdisc_size_table
*tab
);
98 void qdisc_warn_nonwc(char *txt
, struct Qdisc
*qdisc
);
99 int sch_direct_xmit(struct sk_buff
*skb
, struct Qdisc
*q
,
100 struct net_device
*dev
, struct netdev_queue
*txq
,
101 spinlock_t
*root_lock
);
103 void __qdisc_run(struct Qdisc
*q
);
105 static inline void qdisc_run(struct Qdisc
*q
)
107 if (qdisc_run_begin(q
))
111 int tc_classify_compat(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
112 struct tcf_result
*res
);
113 int tc_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
114 struct tcf_result
*res
);
116 /* Calculate maximal size of packet seen by hard_start_xmit
117 routine of this device.
119 static inline unsigned int psched_mtu(const struct net_device
*dev
)
121 return dev
->mtu
+ dev
->hard_header_len
;