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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/net/pkt_sched.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/net/pkt_sched.h')
-rw-r--r--include/net/pkt_sched.h249
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