cregit-Linux how code gets into the kernel

Release 4.12 include/net/pkt_sched.h

Directory: include/net
#ifndef __NET_PKT_SCHED_H

#define __NET_PKT_SCHED_H

#include <linux/jiffies.h>
#include <linux/ktime.h>
#include <linux/if_vlan.h>
#include <net/sch_generic.h>


#define DEFAULT_TX_QUEUE_LEN	1000


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)); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf2275.86%240.00%
Linus Torvalds (pre-git)724.14%360.00%
Total29100.00%5100.00%

/* 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_get_ns()); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy1487.50%133.33%
Eric Dumazet16.25%133.33%
Jarek Poplawski16.25%133.33%
Total16100.00%3100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy1973.08%133.33%
Stephen Hemminger415.38%133.33%
Thomas Graf311.54%133.33%
Total26100.00%3100.00%

struct qdisc_watchdog { u64 last_expires; struct hrtimer timer; struct Qdisc *qdisc; }; void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) { qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); }

Contributors

PersonTokensPropCommitsCommitProp
Jiri Pirko25100.00%1100.00%
Total25100.00%1100.00%

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; int fifo_set_limit(struct Qdisc *q, unsigned int limit); struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, unsigned int limit); int register_qdisc(struct Qdisc_ops *qops); int unregister_qdisc(struct Qdisc_ops *qops); void qdisc_get_default(char *id, size_t len); int qdisc_set_default(const char *id); void qdisc_hash_add(struct Qdisc *q, bool invisible); void qdisc_hash_del(struct Qdisc *q); struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab); void qdisc_put_rtab(struct qdisc_rate_table *tab); void qdisc_put_stab(struct qdisc_size_table *tab); void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, struct net_device *dev, struct netdev_queue *txq, spinlock_t *root_lock, bool validate); void __qdisc_run(struct Qdisc *q);
static inline void qdisc_run(struct Qdisc *q) { if (qdisc_run_begin(q)) __qdisc_run(q); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy1145.83%120.00%
David S. Miller729.17%240.00%
Herbert Xu520.83%120.00%
Eric Dumazet14.17%120.00%
Total24100.00%5100.00%

int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res, bool compat_mode);
static inline __be16 tc_skb_protocol(const struct sk_buff *skb) { /* We need to take extra care in case the skb came via * vlan accelerated path. In that case, use skb->vlan_proto * as the original vlan header was already stripped. */ if (skb_vlan_tag_present(skb)) return skb->vlan_proto; return skb->protocol; }

Contributors

PersonTokensPropCommitsCommitProp
Jiri Pirko31100.00%2100.00%
Total31100.00%2100.00%

/* Calculate maximal size of packet seen by hard_start_xmit routine of this device. */
static inline unsigned int psched_mtu(const struct net_device *dev) { return dev->mtu + dev->hard_header_len; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2191.30%360.00%
Stephen Hemminger14.35%120.00%
Eric Dumazet14.35%120.00%
Total23100.00%5100.00%

#endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)17329.98%612.50%
Patrick McHardy13723.74%816.67%
Jiri Pirko6110.57%36.25%
Thomas Graf5810.05%36.25%
Jarek Poplawski325.55%510.42%
Krishna Kumar284.85%12.08%
Stephen Hemminger254.33%36.25%
Eric Dumazet193.29%816.67%
David S. Miller91.56%24.17%
Jussi Kivilinna91.56%12.08%
Herbert Xu71.21%12.08%
Jiri Kosina50.87%24.17%
Hagen Paul Pfeifer50.87%12.08%
Jesper Dangaard Brouer40.69%12.08%
Daniel Borkmann30.52%12.08%
Florian Westphal10.17%12.08%
Lucas De Marchi10.17%12.08%
Total577100.00%48100.00%
Directory: include/net
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