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 <net/sch_generic.h> 7 8 struct qdisc_walker { 9 int stop; 10 int skip; 11 int count; 12 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); 13 }; 14 15 #define QDISC_ALIGNTO 64 16 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1)) 17 18 static inline void *qdisc_priv(struct Qdisc *q) 19 { 20 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc)); 21 } 22 23 /* 24 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth 25 26 Normal IP packet size ~ 512byte, hence: 27 28 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for 29 10Mbit ethernet. 30 31 10msec resolution -> <50Kbit/sec. 32 33 The result: [34]86 is not good choice for QoS router :-( 34 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. 38 */ 39 40 typedef u64 psched_time_t; 41 typedef long psched_tdiff_t; 42 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) 47 48 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) 49 #define PSCHED_PASTPERFECT 0 50 51 static inline psched_time_t psched_get_time(void) 52 { 53 return PSCHED_NS2TICKS(ktime_get_ns()); 54 } 55 56 static inline psched_tdiff_t 57 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) 58 { 59 return min(tv1 - tv2, bound); 60 } 61 62 struct qdisc_watchdog { 63 struct hrtimer timer; 64 struct Qdisc *qdisc; 65 }; 66 67 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); 68 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle); 69 70 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, 71 psched_time_t expires) 72 { 73 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires), true); 74 } 75 76 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); 77 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; 81 82 int fifo_set_limit(struct Qdisc *q, unsigned int limit); 83 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, 84 unsigned int limit); 85 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); 90 91 void qdisc_list_add(struct Qdisc *q); 92 void qdisc_list_del(struct Qdisc *q); 93 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); 94 struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); 95 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, 96 struct nlattr *tab); 97 void qdisc_put_rtab(struct qdisc_rate_table *tab); 98 void qdisc_put_stab(struct qdisc_size_table *tab); 99 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); 100 int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, 101 struct net_device *dev, struct netdev_queue *txq, 102 spinlock_t *root_lock, bool validate); 103 104 void __qdisc_run(struct Qdisc *q); 105 106 static inline void qdisc_run(struct Qdisc *q) 107 { 108 if (qdisc_run_begin(q)) 109 __qdisc_run(q); 110 } 111 112 int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp, 113 struct tcf_result *res); 114 int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, 115 struct tcf_result *res); 116 117 /* Calculate maximal size of packet seen by hard_start_xmit 118 routine of this device. 119 */ 120 static inline unsigned int psched_mtu(const struct net_device *dev) 121 { 122 return dev->mtu + dev->hard_header_len; 123 } 124 125 #endif 126