1 #ifndef __NET_PKT_SCHED_H
2 #define __NET_PKT_SCHED_H
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>
10 #define DEFAULT_TX_QUEUE_LEN 1000
16 int (*fn
)(struct Qdisc
*, unsigned long cl
, struct qdisc_walker
*);
19 #define QDISC_ALIGNTO 64
20 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
22 static inline void *qdisc_priv(struct Qdisc
*q
)
24 return (char *) q
+ QDISC_ALIGN(sizeof(struct Qdisc
));
28 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
30 Normal IP packet size ~ 512byte, hence:
32 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
35 10msec resolution -> <50Kbit/sec.
37 The result: [34]86 is not good choice for QoS router :-(
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.
44 typedef u64 psched_time_t
;
45 typedef long psched_tdiff_t
;
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)
52 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
53 #define PSCHED_PASTPERFECT 0
55 static inline psched_time_t
psched_get_time(void)
57 return PSCHED_NS2TICKS(ktime_get_ns());
60 static inline psched_tdiff_t
61 psched_tdiff_bounded(psched_time_t tv1
, psched_time_t tv2
, psched_time_t bound
)
63 return min(tv1
- tv2
, bound
);
66 struct qdisc_watchdog
{
72 void qdisc_watchdog_init(struct qdisc_watchdog
*wd
, struct Qdisc
*qdisc
);
73 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog
*wd
, u64 expires
);
75 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog
*wd
,
76 psched_time_t expires
)
78 qdisc_watchdog_schedule_ns(wd
, PSCHED_TICKS2NS(expires
));
81 void qdisc_watchdog_cancel(struct qdisc_watchdog
*wd
);
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
;
87 int fifo_set_limit(struct Qdisc
*q
, unsigned int limit
);
88 struct Qdisc
*fifo_create_dflt(struct Qdisc
*sch
, struct Qdisc_ops
*ops
,
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
);
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
,
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
);
109 void __qdisc_run(struct Qdisc
*q
);
111 static inline void qdisc_run(struct Qdisc
*q
)
113 if (qdisc_run_begin(q
))
117 static inline __be16
tc_skb_protocol(const struct sk_buff
*skb
)
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.
123 if (skb_vlan_tag_present(skb
))
124 return skb
->vlan_proto
;
125 return skb
->protocol
;
128 /* Calculate maximal size of packet seen by hard_start_xmit
129 routine of this device.
131 static inline unsigned int psched_mtu(const struct net_device
*dev
)
133 return dev
->mtu
+ dev
->hard_header_len
;
136 static inline bool is_classid_clsact_ingress(u32 classid
)
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
);
143 static inline bool is_classid_clsact_egress(u32 classid
)
145 return TC_H_MAJ(classid
) == TC_H_MAJ(TC_H_CLSACT
) &&
146 TC_H_MIN(classid
) == TC_H_MIN(TC_H_MIN_EGRESS
);