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 #define DEFAULT_TX_QUEUE_LEN 1000 10 11 struct qdisc_walker { 12 int stop; 13 int skip; 14 int count; 15 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); 16 }; 17 18 #define QDISC_ALIGNTO 64 19 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1)) 20 21 static inline void *qdisc_priv(struct Qdisc *q) 22 { 23 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc)); 24 } 25 26 /* 27 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth 28 29 Normal IP packet size ~ 512byte, hence: 30 31 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for 32 10Mbit ethernet. 33 34 10msec resolution -> <50Kbit/sec. 35 36 The result: [34]86 is not good choice for QoS router :-( 37 38 The things are not so bad, because we may use artificial 39 clock evaluated by integration of network data flow 40 in the most critical places. 41 */ 42 43 typedef u64 psched_time_t; 44 typedef long psched_tdiff_t; 45 46 /* Avoid doing 64 bit divide */ 47 #define PSCHED_SHIFT 6 48 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) 49 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) 50 51 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) 52 #define PSCHED_PASTPERFECT 0 53 54 static inline psched_time_t psched_get_time(void) 55 { 56 return PSCHED_NS2TICKS(ktime_get_ns()); 57 } 58 59 static inline psched_tdiff_t 60 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) 61 { 62 return min(tv1 - tv2, bound); 63 } 64 65 struct qdisc_watchdog { 66 u64 last_expires; 67 struct hrtimer timer; 68 struct Qdisc *qdisc; 69 }; 70 71 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); 72 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires); 73 74 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, 75 psched_time_t expires) 76 { 77 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); 78 } 79 80 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); 81 82 extern struct Qdisc_ops pfifo_qdisc_ops; 83 extern struct Qdisc_ops bfifo_qdisc_ops; 84 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; 85 86 int fifo_set_limit(struct Qdisc *q, unsigned int limit); 87 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, 88 unsigned int limit); 89 90 int register_qdisc(struct Qdisc_ops *qops); 91 int unregister_qdisc(struct Qdisc_ops *qops); 92 void qdisc_get_default(char *id, size_t len); 93 int qdisc_set_default(const char *id); 94 95 void qdisc_hash_add(struct Qdisc *q); 96 void qdisc_hash_del(struct Qdisc *q); 97 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); 98 struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); 99 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, 100 struct nlattr *tab); 101 void qdisc_put_rtab(struct qdisc_rate_table *tab); 102 void qdisc_put_stab(struct qdisc_size_table *tab); 103 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); 104 int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, 105 struct net_device *dev, struct netdev_queue *txq, 106 spinlock_t *root_lock, bool validate); 107 108 void __qdisc_run(struct Qdisc *q); 109 110 static inline void qdisc_run(struct Qdisc *q) 111 { 112 if (qdisc_run_begin(q)) 113 __qdisc_run(q); 114 } 115 116 int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, 117 struct tcf_result *res, bool compat_mode); 118 119 static inline __be16 tc_skb_protocol(const struct sk_buff *skb) 120 { 121 /* We need to take extra care in case the skb came via 122 * vlan accelerated path. In that case, use skb->vlan_proto 123 * as the original vlan header was already stripped. 124 */ 125 if (skb_vlan_tag_present(skb)) 126 return skb->vlan_proto; 127 return skb->protocol; 128 } 129 130 /* Calculate maximal size of packet seen by hard_start_xmit 131 routine of this device. 132 */ 133 static inline unsigned int psched_mtu(const struct net_device *dev) 134 { 135 return dev->mtu + dev->hard_header_len; 136 } 137 138 #endif 139