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TOMOYO Linux Cross Reference
Linux/include/net/pkt_sched.h

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  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 
  9 struct qdisc_walker {
 10         int     stop;
 11         int     skip;
 12         int     count;
 13         int     (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
 14 };
 15 
 16 #define QDISC_ALIGNTO           64
 17 #define QDISC_ALIGN(len)        (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
 18 
 19 static inline void *qdisc_priv(struct Qdisc *q)
 20 {
 21         return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
 22 }
 23 
 24 /* 
 25    Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
 26    
 27    Normal IP packet size ~ 512byte, hence:
 28 
 29    0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
 30    10Mbit ethernet.
 31 
 32    10msec resolution -> <50Kbit/sec.
 33    
 34    The result: [34]86 is not good choice for QoS router :-(
 35 
 36    The things are not so bad, because we may use artificial
 37    clock evaluated by integration of network data flow
 38    in the most critical places.
 39  */
 40 
 41 typedef u64     psched_time_t;
 42 typedef long    psched_tdiff_t;
 43 
 44 /* Avoid doing 64 bit divide */
 45 #define PSCHED_SHIFT                    6
 46 #define PSCHED_TICKS2NS(x)              ((s64)(x) << PSCHED_SHIFT)
 47 #define PSCHED_NS2TICKS(x)              ((x) >> PSCHED_SHIFT)
 48 
 49 #define PSCHED_TICKS_PER_SEC            PSCHED_NS2TICKS(NSEC_PER_SEC)
 50 #define PSCHED_PASTPERFECT              0
 51 
 52 static inline psched_time_t psched_get_time(void)
 53 {
 54         return PSCHED_NS2TICKS(ktime_get_ns());
 55 }
 56 
 57 static inline psched_tdiff_t
 58 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
 59 {
 60         return min(tv1 - tv2, bound);
 61 }
 62 
 63 struct qdisc_watchdog {
 64         struct hrtimer  timer;
 65         struct Qdisc    *qdisc;
 66 };
 67 
 68 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
 69 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle);
 70 
 71 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
 72                                            psched_time_t expires)
 73 {
 74         qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires), true);
 75 }
 76 
 77 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
 78 
 79 extern struct Qdisc_ops pfifo_qdisc_ops;
 80 extern struct Qdisc_ops bfifo_qdisc_ops;
 81 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
 82 
 83 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
 84 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
 85                                unsigned int limit);
 86 
 87 int register_qdisc(struct Qdisc_ops *qops);
 88 int unregister_qdisc(struct Qdisc_ops *qops);
 89 void qdisc_get_default(char *id, size_t len);
 90 int qdisc_set_default(const char *id);
 91 
 92 void qdisc_list_add(struct Qdisc *q);
 93 void qdisc_list_del(struct Qdisc *q);
 94 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
 95 struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
 96 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
 97                                         struct nlattr *tab);
 98 void qdisc_put_rtab(struct qdisc_rate_table *tab);
 99 void qdisc_put_stab(struct qdisc_size_table *tab);
100 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
101 int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
102                     struct net_device *dev, struct netdev_queue *txq,
103                     spinlock_t *root_lock, bool validate);
104 
105 void __qdisc_run(struct Qdisc *q);
106 
107 static inline void qdisc_run(struct Qdisc *q)
108 {
109         if (qdisc_run_begin(q))
110                 __qdisc_run(q);
111 }
112 
113 int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
114                 struct tcf_result *res, bool compat_mode);
115 
116 static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
117 {
118         /* We need to take extra care in case the skb came via
119          * vlan accelerated path. In that case, use skb->vlan_proto
120          * as the original vlan header was already stripped.
121          */
122         if (skb_vlan_tag_present(skb))
123                 return skb->vlan_proto;
124         return skb->protocol;
125 }
126 
127 /* Calculate maximal size of packet seen by hard_start_xmit
128    routine of this device.
129  */
130 static inline unsigned int psched_mtu(const struct net_device *dev)
131 {
132         return dev->mtu + dev->hard_header_len;
133 }
134 
135 #endif
136 

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