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136 lines
3.8 KiB
136 lines
3.8 KiB
#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 <linux/ktime.h> |
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#include <linux/if_vlan.h> |
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#include <net/sch_generic.h> |
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struct qdisc_walker { |
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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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#define QDISC_ALIGNTO 64 |
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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 artificial |
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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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*/ |
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typedef u64 psched_time_t; |
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typedef long psched_tdiff_t; |
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/* Avoid doing 64 bit divide */ |
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#define PSCHED_SHIFT 6 |
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#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) |
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#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) |
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#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) |
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#define PSCHED_PASTPERFECT 0 |
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static inline psched_time_t psched_get_time(void) |
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{ |
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return PSCHED_NS2TICKS(ktime_get_ns()); |
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} |
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static inline psched_tdiff_t |
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psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) |
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{ |
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return min(tv1 - tv2, bound); |
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} |
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struct qdisc_watchdog { |
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u64 last_expires; |
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struct hrtimer timer; |
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struct Qdisc *qdisc; |
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}; |
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void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); |
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void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires); |
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static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, |
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psched_time_t expires) |
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{ |
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qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); |
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} |
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void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); |
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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 struct Qdisc_ops pfifo_head_drop_qdisc_ops; |
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int fifo_set_limit(struct Qdisc *q, unsigned int limit); |
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struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, |
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unsigned int limit); |
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int register_qdisc(struct Qdisc_ops *qops); |
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int unregister_qdisc(struct Qdisc_ops *qops); |
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void qdisc_get_default(char *id, size_t len); |
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int qdisc_set_default(const char *id); |
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void qdisc_hash_add(struct Qdisc *q); |
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void qdisc_hash_del(struct Qdisc *q); |
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struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); |
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struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); |
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struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
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struct nlattr *tab); |
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void qdisc_put_rtab(struct qdisc_rate_table *tab); |
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void qdisc_put_stab(struct qdisc_size_table *tab); |
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void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); |
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int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
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struct net_device *dev, struct netdev_queue *txq, |
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spinlock_t *root_lock, bool validate); |
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void __qdisc_run(struct Qdisc *q); |
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static inline void qdisc_run(struct Qdisc *q) |
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{ |
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if (qdisc_run_begin(q)) |
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__qdisc_run(q); |
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} |
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int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
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struct tcf_result *res, bool compat_mode); |
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static inline __be16 tc_skb_protocol(const struct sk_buff *skb) |
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{ |
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/* We need to take extra care in case the skb came via |
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* vlan accelerated path. In that case, use skb->vlan_proto |
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* as the original vlan header was already stripped. |
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*/ |
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if (skb_vlan_tag_present(skb)) |
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return skb->vlan_proto; |
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return skb->protocol; |
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} |
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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 int psched_mtu(const struct net_device *dev) |
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{ |
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return dev->mtu + dev->hard_header_len; |
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} |
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#endif
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