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