#ifndef __NET_PKT_SCHED_H #define __NET_PKT_SCHED_H #include <linux/jiffies.h> #include <linux/ktime.h> #include <net/sch_generic.h> struct qdisc_walker { int stop; int skip; int count; int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); }; #define QDISC_ALIGNTO 64 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1)) static inline void *qdisc_priv(struct Qdisc *q) { return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc)); } /* Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth Normal IP packet size ~ 512byte, hence: 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for 10Mbit ethernet. 10msec resolution -> <50Kbit/sec. The result: [34]86 is not good choice for QoS router :-( The things are not so bad, because we may use artificial clock evaluated by integration of network data flow in the most critical places. */ typedef u64 psched_time_t; typedef long psched_tdiff_t; /* Avoid doing 64 bit divide */ #define PSCHED_SHIFT 6 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) #define PSCHED_PASTPERFECT 0 static inline psched_time_t psched_get_time(void) { return PSCHED_NS2TICKS(ktime_to_ns(ktime_get())); } static inline psched_tdiff_t psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) { return min(tv1 - tv2, bound); } struct qdisc_watchdog { struct hrtimer timer; struct Qdisc *qdisc; }; extern void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires); extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); extern struct Qdisc_ops pfifo_qdisc_ops; extern struct Qdisc_ops bfifo_qdisc_ops; extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; extern int fifo_set_limit(struct Qdisc *q, unsigned int limit); extern struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, unsigned int limit); extern int register_qdisc(struct Qdisc_ops *qops); extern int unregister_qdisc(struct Qdisc_ops *qops); extern void qdisc_list_del(struct Qdisc *q); extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab); extern void qdisc_put_rtab(struct qdisc_rate_table *tab); extern void qdisc_put_stab(struct qdisc_size_table *tab); extern void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc); extern int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, struct net_device *dev, struct netdev_queue *txq, spinlock_t *root_lock); extern void __qdisc_run(struct Qdisc *q); static inline void qdisc_run(struct Qdisc *q) { if (qdisc_run_begin(q)) __qdisc_run(q); } extern int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res); extern int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res); /* Calculate maximal size of packet seen by hard_start_xmit routine of this device. */ static inline unsigned psched_mtu(const struct net_device *dev) { return dev->mtu + dev->hard_header_len; } #endif