diff options
Diffstat (limited to 'include/net/pkt_sched.h')
| -rw-r--r-- | include/net/pkt_sched.h | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h new file mode 100644 index 00000000000..87496e3aa33 --- /dev/null +++ b/include/net/pkt_sched.h @@ -0,0 +1,249 @@ +#ifndef __NET_PKT_SCHED_H +#define __NET_PKT_SCHED_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 *); +}; + +extern rwlock_t qdisc_tree_lock; + +#define QDISC_ALIGN 32 +#define QDISC_ALIGN_CONST (QDISC_ALIGN - 1) + +static inline void *qdisc_priv(struct Qdisc *q) +{ + return (char *)q + ((sizeof(struct Qdisc) + QDISC_ALIGN_CONST) + & ~QDISC_ALIGN_CONST); +} + +/* + 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 artifical + clock evaluated by integration of network data flow + in the most critical places. + + Note: we do not use fastgettimeofday. + The reason is that, when it is not the same thing as + gettimeofday, it returns invalid timestamp, which is + not updated, when net_bh is active. + */ + +/* General note about internal clock. + + Any clock source returns time intervals, measured in units + close to 1usec. With source CONFIG_NET_SCH_CLK_GETTIMEOFDAY it is precisely + microseconds, otherwise something close but different chosen to minimize + arithmetic cost. Ratio usec/internal untis in form nominator/denominator + may be read from /proc/net/psched. + */ + + +#ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY + +typedef struct timeval psched_time_t; +typedef long psched_tdiff_t; + +#define PSCHED_GET_TIME(stamp) do_gettimeofday(&(stamp)) +#define PSCHED_US2JIFFIE(usecs) (((usecs)+(1000000/HZ-1))/(1000000/HZ)) +#define PSCHED_JIFFIE2US(delay) ((delay)*(1000000/HZ)) + +#else /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */ + +typedef u64 psched_time_t; +typedef long psched_tdiff_t; + +#ifdef CONFIG_NET_SCH_CLK_JIFFIES + +#if HZ < 96 +#define PSCHED_JSCALE 14 +#elif HZ >= 96 && HZ < 192 +#define PSCHED_JSCALE 13 +#elif HZ >= 192 && HZ < 384 +#define PSCHED_JSCALE 12 +#elif HZ >= 384 && HZ < 768 +#define PSCHED_JSCALE 11 +#elif HZ >= 768 +#define PSCHED_JSCALE 10 +#endif + +#define PSCHED_GET_TIME(stamp) ((stamp) = (get_jiffies_64()<<PSCHED_JSCALE)) +#define PSCHED_US2JIFFIE(delay) (((delay)+(1<<PSCHED_JSCALE)-1)>>PSCHED_JSCALE) +#define PSCHED_JIFFIE2US(delay) ((delay)<<PSCHED_JSCALE) + +#endif /* CONFIG_NET_SCH_CLK_JIFFIES */ +#ifdef CONFIG_NET_SCH_CLK_CPU +#include <asm/timex.h> + +extern psched_tdiff_t psched_clock_per_hz; +extern int psched_clock_scale; +extern psched_time_t psched_time_base; +extern cycles_t psched_time_mark; + +#define PSCHED_GET_TIME(stamp) \ +do { \ + cycles_t cur = get_cycles(); \ + if (sizeof(cycles_t) == sizeof(u32)) { \ + if (cur <= psched_time_mark) \ + psched_time_base += 0x100000000ULL; \ + psched_time_mark = cur; \ + (stamp) = (psched_time_base + cur)>>psched_clock_scale; \ + } else { \ + (stamp) = cur>>psched_clock_scale; \ + } \ +} while (0) +#define PSCHED_US2JIFFIE(delay) (((delay)+psched_clock_per_hz-1)/psched_clock_per_hz) +#define PSCHED_JIFFIE2US(delay) ((delay)*psched_clock_per_hz) + +#endif /* CONFIG_NET_SCH_CLK_CPU */ + +#endif /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */ + +#ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY +#define PSCHED_TDIFF(tv1, tv2) \ +({ \ + int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \ + int __delta = (tv1).tv_usec - (tv2).tv_usec; \ + if (__delta_sec) { \ + switch (__delta_sec) { \ + default: \ + __delta = 0; \ + case 2: \ + __delta += 1000000; \ + case 1: \ + __delta += 1000000; \ + } \ + } \ + __delta; \ +}) + +static inline int +psched_tod_diff(int delta_sec, int bound) +{ + int delta; + + if (bound <= 1000000 || delta_sec > (0x7FFFFFFF/1000000)-1) + return bound; + delta = delta_sec * 1000000; + if (delta > bound) + delta = bound; + return delta; +} + +#define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \ +({ \ + int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \ + int __delta = (tv1).tv_usec - (tv2).tv_usec; \ + switch (__delta_sec) { \ + default: \ + __delta = psched_tod_diff(__delta_sec, bound); break; \ + case 2: \ + __delta += 1000000; \ + case 1: \ + __delta += 1000000; \ + case 0: ; \ + } \ + __delta; \ +}) + +#define PSCHED_TLESS(tv1, tv2) (((tv1).tv_usec < (tv2).tv_usec && \ + (tv1).tv_sec <= (tv2).tv_sec) || \ + (tv1).tv_sec < (tv2).tv_sec) + +#define PSCHED_TADD2(tv, delta, tv_res) \ +({ \ + int __delta = (tv).tv_usec + (delta); \ + (tv_res).tv_sec = (tv).tv_sec; \ + if (__delta > 1000000) { (tv_res).tv_sec++; __delta -= 1000000; } \ + (tv_res).tv_usec = __delta; \ +}) + +#define PSCHED_TADD(tv, delta) \ +({ \ + (tv).tv_usec += (delta); \ + if ((tv).tv_usec > 1000000) { (tv).tv_sec++; \ + (tv).tv_usec -= 1000000; } \ +}) + +/* Set/check that time is in the "past perfect"; + it depends on concrete representation of system time + */ + +#define PSCHED_SET_PASTPERFECT(t) ((t).tv_sec = 0) +#define PSCHED_IS_PASTPERFECT(t) ((t).tv_sec == 0) + +#define PSCHED_AUDIT_TDIFF(t) ({ if ((t) > 2000000) (t) = 2000000; }) + +#else /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */ + +#define PSCHED_TDIFF(tv1, tv2) (long)((tv1) - (tv2)) +#define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \ + min_t(long long, (tv1) - (tv2), bound) + + +#define PSCHED_TLESS(tv1, tv2) ((tv1) < (tv2)) +#define PSCHED_TADD2(tv, delta, tv_res) ((tv_res) = (tv) + (delta)) +#define PSCHED_TADD(tv, delta) ((tv) += (delta)) +#define PSCHED_SET_PASTPERFECT(t) ((t) = 0) +#define PSCHED_IS_PASTPERFECT(t) ((t) == 0) +#define PSCHED_AUDIT_TDIFF(t) + +#endif /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */ + +extern struct Qdisc noop_qdisc; +extern struct Qdisc_ops noop_qdisc_ops; +extern struct Qdisc_ops pfifo_qdisc_ops; +extern struct Qdisc_ops bfifo_qdisc_ops; + +extern int register_qdisc(struct Qdisc_ops *qops); +extern int unregister_qdisc(struct Qdisc_ops *qops); +extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); +extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); +extern void dev_init_scheduler(struct net_device *dev); +extern void dev_shutdown(struct net_device *dev); +extern void dev_activate(struct net_device *dev); +extern void dev_deactivate(struct net_device *dev); +extern void qdisc_reset(struct Qdisc *qdisc); +extern void qdisc_destroy(struct Qdisc *qdisc); +extern struct Qdisc * qdisc_create_dflt(struct net_device *dev, + struct Qdisc_ops *ops); +extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, + struct rtattr *tab); +extern void qdisc_put_rtab(struct qdisc_rate_table *tab); + +extern int qdisc_restart(struct net_device *dev); + +static inline void qdisc_run(struct net_device *dev) +{ + while (!netif_queue_stopped(dev) && qdisc_restart(dev) < 0) + /* NOTHING */; +} + +extern int tc_classify(struct sk_buff *skb, 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(struct net_device *dev) +{ + unsigned mtu = dev->mtu; + return dev->hard_header ? mtu + dev->hard_header_len : mtu; +} + +#endif |