242 lines
6.6 KiB
C
242 lines
6.6 KiB
C
#ifndef __NET_PKT_SCHED_H
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#define __NET_PKT_SCHED_H
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#include <linux/jiffies.h>
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#include <net/sch_generic.h>
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struct qdisc_walker
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{
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int stop;
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int skip;
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int count;
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int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
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};
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extern rwlock_t qdisc_tree_lock;
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#define QDISC_ALIGNTO 32
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#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
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static inline void *qdisc_priv(struct Qdisc *q)
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{
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return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
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}
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/*
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Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
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Normal IP packet size ~ 512byte, hence:
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0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
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10Mbit ethernet.
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10msec resolution -> <50Kbit/sec.
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The result: [34]86 is not good choice for QoS router :-(
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The things are not so bad, because we may use artifical
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clock evaluated by integration of network data flow
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in the most critical places.
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Note: we do not use fastgettimeofday.
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The reason is that, when it is not the same thing as
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gettimeofday, it returns invalid timestamp, which is
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not updated, when net_bh is active.
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*/
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/* General note about internal clock.
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Any clock source returns time intervals, measured in units
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close to 1usec. With source CONFIG_NET_SCH_CLK_GETTIMEOFDAY it is precisely
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microseconds, otherwise something close but different chosen to minimize
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arithmetic cost. Ratio usec/internal untis in form nominator/denominator
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may be read from /proc/net/psched.
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*/
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#ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY
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typedef struct timeval psched_time_t;
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typedef long psched_tdiff_t;
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#define PSCHED_GET_TIME(stamp) do_gettimeofday(&(stamp))
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#define PSCHED_US2JIFFIE(usecs) usecs_to_jiffies(usecs)
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#define PSCHED_JIFFIE2US(delay) jiffies_to_usecs(delay)
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#else /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
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typedef u64 psched_time_t;
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typedef long psched_tdiff_t;
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#ifdef CONFIG_NET_SCH_CLK_JIFFIES
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#if HZ < 96
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#define PSCHED_JSCALE 14
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#elif HZ >= 96 && HZ < 192
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#define PSCHED_JSCALE 13
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#elif HZ >= 192 && HZ < 384
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#define PSCHED_JSCALE 12
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#elif HZ >= 384 && HZ < 768
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#define PSCHED_JSCALE 11
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#elif HZ >= 768
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#define PSCHED_JSCALE 10
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#endif
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#define PSCHED_GET_TIME(stamp) ((stamp) = (get_jiffies_64()<<PSCHED_JSCALE))
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#define PSCHED_US2JIFFIE(delay) (((delay)+(1<<PSCHED_JSCALE)-1)>>PSCHED_JSCALE)
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#define PSCHED_JIFFIE2US(delay) ((delay)<<PSCHED_JSCALE)
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#endif /* CONFIG_NET_SCH_CLK_JIFFIES */
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#ifdef CONFIG_NET_SCH_CLK_CPU
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#include <asm/timex.h>
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extern psched_tdiff_t psched_clock_per_hz;
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extern int psched_clock_scale;
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extern psched_time_t psched_time_base;
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extern cycles_t psched_time_mark;
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#define PSCHED_GET_TIME(stamp) \
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do { \
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cycles_t cur = get_cycles(); \
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if (sizeof(cycles_t) == sizeof(u32)) { \
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if (cur <= psched_time_mark) \
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psched_time_base += 0x100000000ULL; \
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psched_time_mark = cur; \
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(stamp) = (psched_time_base + cur)>>psched_clock_scale; \
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} else { \
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(stamp) = cur>>psched_clock_scale; \
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} \
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} while (0)
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#define PSCHED_US2JIFFIE(delay) (((delay)+psched_clock_per_hz-1)/psched_clock_per_hz)
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#define PSCHED_JIFFIE2US(delay) ((delay)*psched_clock_per_hz)
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#endif /* CONFIG_NET_SCH_CLK_CPU */
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#endif /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
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#ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY
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#define PSCHED_TDIFF(tv1, tv2) \
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({ \
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int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
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int __delta = (tv1).tv_usec - (tv2).tv_usec; \
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if (__delta_sec) { \
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switch (__delta_sec) { \
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default: \
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__delta = 0; \
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case 2: \
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__delta += USEC_PER_SEC; \
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case 1: \
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__delta += USEC_PER_SEC; \
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} \
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} \
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__delta; \
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})
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static inline int
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psched_tod_diff(int delta_sec, int bound)
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{
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int delta;
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if (bound <= USEC_PER_SEC || delta_sec > (0x7FFFFFFF/USEC_PER_SEC)-1)
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return bound;
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delta = delta_sec * USEC_PER_SEC;
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if (delta > bound || delta < 0)
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delta = bound;
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return delta;
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}
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#define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \
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({ \
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int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
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int __delta = (tv1).tv_usec - (tv2).tv_usec; \
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switch (__delta_sec) { \
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default: \
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__delta = psched_tod_diff(__delta_sec, bound); break; \
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case 2: \
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__delta += USEC_PER_SEC; \
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case 1: \
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__delta += USEC_PER_SEC; \
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case 0: \
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if (__delta > bound || __delta < 0) \
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__delta = bound; \
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} \
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__delta; \
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})
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#define PSCHED_TLESS(tv1, tv2) (((tv1).tv_usec < (tv2).tv_usec && \
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(tv1).tv_sec <= (tv2).tv_sec) || \
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(tv1).tv_sec < (tv2).tv_sec)
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#define PSCHED_TADD2(tv, delta, tv_res) \
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({ \
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int __delta = (tv).tv_usec + (delta); \
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(tv_res).tv_sec = (tv).tv_sec; \
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if (__delta > USEC_PER_SEC) { (tv_res).tv_sec++; __delta -= USEC_PER_SEC; } \
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(tv_res).tv_usec = __delta; \
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})
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#define PSCHED_TADD(tv, delta) \
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({ \
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(tv).tv_usec += (delta); \
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if ((tv).tv_usec > USEC_PER_SEC) { (tv).tv_sec++; \
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(tv).tv_usec -= USEC_PER_SEC; } \
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})
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/* Set/check that time is in the "past perfect";
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it depends on concrete representation of system time
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*/
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#define PSCHED_SET_PASTPERFECT(t) ((t).tv_sec = 0)
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#define PSCHED_IS_PASTPERFECT(t) ((t).tv_sec == 0)
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#define PSCHED_AUDIT_TDIFF(t) ({ if ((t) > 2000000) (t) = 2000000; })
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#else /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
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#define PSCHED_TDIFF(tv1, tv2) (long)((tv1) - (tv2))
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#define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \
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min_t(long long, (tv1) - (tv2), bound)
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#define PSCHED_TLESS(tv1, tv2) ((tv1) < (tv2))
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#define PSCHED_TADD2(tv, delta, tv_res) ((tv_res) = (tv) + (delta))
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#define PSCHED_TADD(tv, delta) ((tv) += (delta))
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#define PSCHED_SET_PASTPERFECT(t) ((t) = 0)
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#define PSCHED_IS_PASTPERFECT(t) ((t) == 0)
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#define PSCHED_AUDIT_TDIFF(t)
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#endif /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
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extern struct Qdisc_ops pfifo_qdisc_ops;
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extern struct Qdisc_ops bfifo_qdisc_ops;
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extern int register_qdisc(struct Qdisc_ops *qops);
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extern int unregister_qdisc(struct Qdisc_ops *qops);
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extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
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extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
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extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
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struct rtattr *tab);
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extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
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extern int qdisc_restart(struct net_device *dev);
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static inline void qdisc_run(struct net_device *dev)
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{
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while (!netif_queue_stopped(dev) && qdisc_restart(dev) < 0)
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/* NOTHING */;
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}
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extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
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struct tcf_result *res);
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/* Calculate maximal size of packet seen by hard_start_xmit
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routine of this device.
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*/
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static inline unsigned psched_mtu(struct net_device *dev)
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{
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unsigned mtu = dev->mtu;
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return dev->hard_header ? mtu + dev->hard_header_len : mtu;
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}
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#endif
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