409 lines
8.4 KiB
C
Executable File
409 lines
8.4 KiB
C
Executable File
/*
|
|
* net/sched/sch_prio.c Simple 3-band priority "scheduler".
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
|
* Fixes: 19990609: J Hadi Salim <hadi@nortelnetworks.com>:
|
|
* Init -- EINVAL when opt undefined
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/netlink.h>
|
|
#include <net/pkt_sched.h>
|
|
|
|
|
|
struct prio_sched_data {
|
|
int bands;
|
|
struct tcf_proto __rcu *filter_list;
|
|
u8 prio2band[TC_PRIO_MAX+1];
|
|
struct Qdisc *queues[TCQ_PRIO_BANDS];
|
|
};
|
|
|
|
|
|
static struct Qdisc *
|
|
prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
u32 band = skb->priority;
|
|
struct tcf_result res;
|
|
struct tcf_proto *fl;
|
|
int err;
|
|
|
|
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
|
|
if (TC_H_MAJ(skb->priority) != sch->handle) {
|
|
fl = rcu_dereference_bh(q->filter_list);
|
|
err = tc_classify(skb, fl, &res);
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
switch (err) {
|
|
case TC_ACT_STOLEN:
|
|
case TC_ACT_QUEUED:
|
|
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
|
|
case TC_ACT_SHOT:
|
|
return NULL;
|
|
}
|
|
#endif
|
|
if (!fl || err < 0) {
|
|
if (TC_H_MAJ(band))
|
|
band = 0;
|
|
return q->queues[q->prio2band[band & TC_PRIO_MAX]];
|
|
}
|
|
band = res.classid;
|
|
}
|
|
band = TC_H_MIN(band) - 1;
|
|
if (band >= q->bands)
|
|
return q->queues[q->prio2band[0]];
|
|
|
|
return q->queues[band];
|
|
}
|
|
|
|
static int
|
|
prio_enqueue(struct sk_buff *skb, struct Qdisc *sch)
|
|
{
|
|
struct Qdisc *qdisc;
|
|
int ret;
|
|
|
|
qdisc = prio_classify(skb, sch, &ret);
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (qdisc == NULL) {
|
|
|
|
if (ret & __NET_XMIT_BYPASS)
|
|
qdisc_qstats_drop(sch);
|
|
kfree_skb(skb);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
ret = qdisc_enqueue(skb, qdisc);
|
|
if (ret == NET_XMIT_SUCCESS) {
|
|
sch->q.qlen++;
|
|
return NET_XMIT_SUCCESS;
|
|
}
|
|
if (net_xmit_drop_count(ret))
|
|
qdisc_qstats_drop(sch);
|
|
return ret;
|
|
}
|
|
|
|
static struct sk_buff *prio_peek(struct Qdisc *sch)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
int prio;
|
|
|
|
for (prio = 0; prio < q->bands; prio++) {
|
|
struct Qdisc *qdisc = q->queues[prio];
|
|
struct sk_buff *skb = qdisc->ops->peek(qdisc);
|
|
if (skb)
|
|
return skb;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct sk_buff *prio_dequeue(struct Qdisc *sch)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
int prio;
|
|
|
|
for (prio = 0; prio < q->bands; prio++) {
|
|
struct Qdisc *qdisc = q->queues[prio];
|
|
struct sk_buff *skb = qdisc_dequeue_peeked(qdisc);
|
|
if (skb) {
|
|
qdisc_bstats_update(sch, skb);
|
|
sch->q.qlen--;
|
|
return skb;
|
|
}
|
|
}
|
|
return NULL;
|
|
|
|
}
|
|
|
|
static unsigned int prio_drop(struct Qdisc *sch)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
int prio;
|
|
unsigned int len;
|
|
struct Qdisc *qdisc;
|
|
|
|
for (prio = q->bands-1; prio >= 0; prio--) {
|
|
qdisc = q->queues[prio];
|
|
if (qdisc->ops->drop && (len = qdisc->ops->drop(qdisc)) != 0) {
|
|
sch->q.qlen--;
|
|
return len;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void
|
|
prio_reset(struct Qdisc *sch)
|
|
{
|
|
int prio;
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
for (prio = 0; prio < q->bands; prio++)
|
|
qdisc_reset(q->queues[prio]);
|
|
sch->q.qlen = 0;
|
|
}
|
|
|
|
static void
|
|
prio_destroy(struct Qdisc *sch)
|
|
{
|
|
int prio;
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
tcf_destroy_chain(&q->filter_list);
|
|
for (prio = 0; prio < q->bands; prio++)
|
|
qdisc_destroy(q->queues[prio]);
|
|
}
|
|
|
|
static int prio_tune(struct Qdisc *sch, struct nlattr *opt)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
struct tc_prio_qopt *qopt;
|
|
int i;
|
|
|
|
if (nla_len(opt) < sizeof(*qopt))
|
|
return -EINVAL;
|
|
qopt = nla_data(opt);
|
|
|
|
if (qopt->bands > TCQ_PRIO_BANDS || qopt->bands < 2)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i <= TC_PRIO_MAX; i++) {
|
|
if (qopt->priomap[i] >= qopt->bands)
|
|
return -EINVAL;
|
|
}
|
|
|
|
sch_tree_lock(sch);
|
|
q->bands = qopt->bands;
|
|
memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1);
|
|
|
|
for (i = q->bands; i < TCQ_PRIO_BANDS; i++) {
|
|
struct Qdisc *child = q->queues[i];
|
|
q->queues[i] = &noop_qdisc;
|
|
if (child != &noop_qdisc) {
|
|
qdisc_tree_decrease_qlen(child, child->q.qlen);
|
|
qdisc_destroy(child);
|
|
}
|
|
}
|
|
sch_tree_unlock(sch);
|
|
|
|
for (i = 0; i < q->bands; i++) {
|
|
if (q->queues[i] == &noop_qdisc) {
|
|
struct Qdisc *child, *old;
|
|
|
|
child = qdisc_create_dflt(sch->dev_queue,
|
|
&pfifo_qdisc_ops,
|
|
TC_H_MAKE(sch->handle, i + 1));
|
|
if (child) {
|
|
sch_tree_lock(sch);
|
|
old = q->queues[i];
|
|
q->queues[i] = child;
|
|
|
|
if (old != &noop_qdisc) {
|
|
qdisc_tree_decrease_qlen(old,
|
|
old->q.qlen);
|
|
qdisc_destroy(old);
|
|
}
|
|
sch_tree_unlock(sch);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int prio_init(struct Qdisc *sch, struct nlattr *opt)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
int i;
|
|
|
|
for (i = 0; i < TCQ_PRIO_BANDS; i++)
|
|
q->queues[i] = &noop_qdisc;
|
|
|
|
if (opt == NULL) {
|
|
return -EINVAL;
|
|
} else {
|
|
int err;
|
|
|
|
if ((err = prio_tune(sch, opt)) != 0)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int prio_dump(struct Qdisc *sch, struct sk_buff *skb)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct tc_prio_qopt opt;
|
|
|
|
opt.bands = q->bands;
|
|
memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX + 1);
|
|
|
|
if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
|
|
goto nla_put_failure;
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
|
|
struct Qdisc **old)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
unsigned long band = arg - 1;
|
|
|
|
if (new == NULL)
|
|
new = &noop_qdisc;
|
|
|
|
sch_tree_lock(sch);
|
|
*old = q->queues[band];
|
|
q->queues[band] = new;
|
|
qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
|
|
qdisc_reset(*old);
|
|
sch_tree_unlock(sch);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct Qdisc *
|
|
prio_leaf(struct Qdisc *sch, unsigned long arg)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
unsigned long band = arg - 1;
|
|
|
|
return q->queues[band];
|
|
}
|
|
|
|
static unsigned long prio_get(struct Qdisc *sch, u32 classid)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
unsigned long band = TC_H_MIN(classid);
|
|
|
|
if (band - 1 >= q->bands)
|
|
return 0;
|
|
return band;
|
|
}
|
|
|
|
static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid)
|
|
{
|
|
return prio_get(sch, classid);
|
|
}
|
|
|
|
|
|
static void prio_put(struct Qdisc *q, unsigned long cl)
|
|
{
|
|
}
|
|
|
|
static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb,
|
|
struct tcmsg *tcm)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
tcm->tcm_handle |= TC_H_MIN(cl);
|
|
tcm->tcm_info = q->queues[cl-1]->handle;
|
|
return 0;
|
|
}
|
|
|
|
static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
|
|
struct gnet_dump *d)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
struct Qdisc *cl_q;
|
|
|
|
cl_q = q->queues[cl - 1];
|
|
if (gnet_stats_copy_basic(d, NULL, &cl_q->bstats) < 0 ||
|
|
gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
int prio;
|
|
|
|
if (arg->stop)
|
|
return;
|
|
|
|
for (prio = 0; prio < q->bands; prio++) {
|
|
if (arg->count < arg->skip) {
|
|
arg->count++;
|
|
continue;
|
|
}
|
|
if (arg->fn(sch, prio + 1, arg) < 0) {
|
|
arg->stop = 1;
|
|
break;
|
|
}
|
|
arg->count++;
|
|
}
|
|
}
|
|
|
|
static struct tcf_proto __rcu **prio_find_tcf(struct Qdisc *sch,
|
|
unsigned long cl)
|
|
{
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
if (cl)
|
|
return NULL;
|
|
return &q->filter_list;
|
|
}
|
|
|
|
static const struct Qdisc_class_ops prio_class_ops = {
|
|
.graft = prio_graft,
|
|
.leaf = prio_leaf,
|
|
.get = prio_get,
|
|
.put = prio_put,
|
|
.walk = prio_walk,
|
|
.tcf_chain = prio_find_tcf,
|
|
.bind_tcf = prio_bind,
|
|
.unbind_tcf = prio_put,
|
|
.dump = prio_dump_class,
|
|
.dump_stats = prio_dump_class_stats,
|
|
};
|
|
|
|
static struct Qdisc_ops prio_qdisc_ops __read_mostly = {
|
|
.next = NULL,
|
|
.cl_ops = &prio_class_ops,
|
|
.id = "prio",
|
|
.priv_size = sizeof(struct prio_sched_data),
|
|
.enqueue = prio_enqueue,
|
|
.dequeue = prio_dequeue,
|
|
.peek = prio_peek,
|
|
.drop = prio_drop,
|
|
.init = prio_init,
|
|
.reset = prio_reset,
|
|
.destroy = prio_destroy,
|
|
.change = prio_tune,
|
|
.dump = prio_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init prio_module_init(void)
|
|
{
|
|
return register_qdisc(&prio_qdisc_ops);
|
|
}
|
|
|
|
static void __exit prio_module_exit(void)
|
|
{
|
|
unregister_qdisc(&prio_qdisc_ops);
|
|
}
|
|
|
|
module_init(prio_module_init)
|
|
module_exit(prio_module_exit)
|
|
|
|
MODULE_LICENSE("GPL");
|