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/*
* net/sched/sch_prio.c Simple 3-band priority "scheduler".
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*/
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/notifier.h>
#include <net/ip.h>
#include <net/route.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
/* New N-band generic scheduler */
struct prio_sched_data
{
int qbytes;
int bands;
u8 prio2band[8];
struct Qdisc *queues[8];
};
static int
prio_enqueue(struct sk_buff *skb, struct Qdisc* sch)
{
struct prio_sched_data *q = (struct prio_sched_data *)sch->data;
int prio = q->prio2band[skb->priority&7];
struct Qdisc *qdisc;
qdisc = q->queues[prio];
if (qdisc->enqueue(skb, qdisc) == 0) {
q->qbytes += skb->len;
sch->q.qlen++;
return 0;
}
return 1;
}
static struct sk_buff *
prio_dequeue(struct Qdisc* sch)
{
struct sk_buff *skb;
struct prio_sched_data *q = (struct prio_sched_data *)sch->data;
int prio;
struct Qdisc *qdisc;
for (prio = 0; prio < q->bands; prio++) {
qdisc = q->queues[prio];
skb = qdisc->dequeue(qdisc);
if (skb) {
q->qbytes -= skb->len;
sch->q.qlen--;
return skb;
}
}
return NULL;
}
static void
prio_reset(struct Qdisc* sch)
{
int prio;
struct prio_sched_data *q = (struct prio_sched_data *)sch->data;
for (prio=0; prio<q->bands; prio++)
qdisc_reset(q->queues[prio]);
q->qbytes = 0;
}
static void
prio_destroy(struct Qdisc* sch)
{
int prio;
struct prio_sched_data *q = (struct prio_sched_data *)sch->data;
for (prio=0; prio<q->bands; prio++) {
qdisc_destroy(q->queues[prio]);
q->queues[prio] = &noop_qdisc;
}
}
static int prio_init(struct Qdisc *sch, void *arg)
{
const static u8 prio2band[8] = { 1, 2, 2, 2, 1, 2, 0, 0 };
struct prio_sched_data *q;
int i;
q = (struct prio_sched_data *)sch->data;
q->bands = 3;
memcpy(q->prio2band, prio2band, sizeof(prio2band));
for (i=0; i<q->bands; i++)
q->queues[i] = &noop_qdisc;
return 0;
}
struct Qdisc_ops prio_ops =
{
NULL,
"prio",
0,
sizeof(struct prio_sched_data),
prio_enqueue,
prio_dequeue,
prio_reset,
prio_destroy,
prio_init,
};
#ifdef MODULE
#include <linux/module.h>
int init_module(void)
{
int err;
/* Load once and never free it. */
MOD_INC_USE_COUNT;
err = register_qdisc(&prio_ops);
if (err)
MOD_DEC_USE_COUNT;
return err;
}
void cleanup_module(void)
{
}
#endif
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