mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
e046fa895c
use tc_qdisc_stats_dump() in qdisc. Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com> Reviewed-by: Victor Nogueira <victor@mojatatu.com> Tested-by: Victor Nogueira <victor@mojatatu.com> Acked-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
497 lines
11 KiB
C
497 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* net/sched/sch_drr.c Deficit Round Robin scheduler
|
|
*
|
|
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/pkt_sched.h>
|
|
#include <net/sch_generic.h>
|
|
#include <net/pkt_sched.h>
|
|
#include <net/pkt_cls.h>
|
|
|
|
struct drr_class {
|
|
struct Qdisc_class_common common;
|
|
unsigned int filter_cnt;
|
|
|
|
struct gnet_stats_basic_sync bstats;
|
|
struct gnet_stats_queue qstats;
|
|
struct net_rate_estimator __rcu *rate_est;
|
|
struct list_head alist;
|
|
struct Qdisc *qdisc;
|
|
|
|
u32 quantum;
|
|
u32 deficit;
|
|
};
|
|
|
|
struct drr_sched {
|
|
struct list_head active;
|
|
struct tcf_proto __rcu *filter_list;
|
|
struct tcf_block *block;
|
|
struct Qdisc_class_hash clhash;
|
|
};
|
|
|
|
static struct drr_class *drr_find_class(struct Qdisc *sch, u32 classid)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
struct Qdisc_class_common *clc;
|
|
|
|
clc = qdisc_class_find(&q->clhash, classid);
|
|
if (clc == NULL)
|
|
return NULL;
|
|
return container_of(clc, struct drr_class, common);
|
|
}
|
|
|
|
static const struct nla_policy drr_policy[TCA_DRR_MAX + 1] = {
|
|
[TCA_DRR_QUANTUM] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
|
|
struct nlattr **tca, unsigned long *arg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
struct drr_class *cl = (struct drr_class *)*arg;
|
|
struct nlattr *opt = tca[TCA_OPTIONS];
|
|
struct nlattr *tb[TCA_DRR_MAX + 1];
|
|
u32 quantum;
|
|
int err;
|
|
|
|
if (!opt) {
|
|
NL_SET_ERR_MSG(extack, "DRR options are required for this operation");
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = nla_parse_nested_deprecated(tb, TCA_DRR_MAX, opt, drr_policy,
|
|
extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[TCA_DRR_QUANTUM]) {
|
|
quantum = nla_get_u32(tb[TCA_DRR_QUANTUM]);
|
|
if (quantum == 0) {
|
|
NL_SET_ERR_MSG(extack, "Specified DRR quantum cannot be zero");
|
|
return -EINVAL;
|
|
}
|
|
} else
|
|
quantum = psched_mtu(qdisc_dev(sch));
|
|
|
|
if (cl != NULL) {
|
|
if (tca[TCA_RATE]) {
|
|
err = gen_replace_estimator(&cl->bstats, NULL,
|
|
&cl->rate_est,
|
|
NULL, true,
|
|
tca[TCA_RATE]);
|
|
if (err) {
|
|
NL_SET_ERR_MSG(extack, "Failed to replace estimator");
|
|
return err;
|
|
}
|
|
}
|
|
|
|
sch_tree_lock(sch);
|
|
if (tb[TCA_DRR_QUANTUM])
|
|
cl->quantum = quantum;
|
|
sch_tree_unlock(sch);
|
|
|
|
return 0;
|
|
}
|
|
|
|
cl = kzalloc(sizeof(struct drr_class), GFP_KERNEL);
|
|
if (cl == NULL)
|
|
return -ENOBUFS;
|
|
|
|
gnet_stats_basic_sync_init(&cl->bstats);
|
|
cl->common.classid = classid;
|
|
cl->quantum = quantum;
|
|
cl->qdisc = qdisc_create_dflt(sch->dev_queue,
|
|
&pfifo_qdisc_ops, classid,
|
|
NULL);
|
|
if (cl->qdisc == NULL)
|
|
cl->qdisc = &noop_qdisc;
|
|
else
|
|
qdisc_hash_add(cl->qdisc, true);
|
|
|
|
if (tca[TCA_RATE]) {
|
|
err = gen_replace_estimator(&cl->bstats, NULL, &cl->rate_est,
|
|
NULL, true, tca[TCA_RATE]);
|
|
if (err) {
|
|
NL_SET_ERR_MSG(extack, "Failed to replace estimator");
|
|
qdisc_put(cl->qdisc);
|
|
kfree(cl);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
sch_tree_lock(sch);
|
|
qdisc_class_hash_insert(&q->clhash, &cl->common);
|
|
sch_tree_unlock(sch);
|
|
|
|
qdisc_class_hash_grow(sch, &q->clhash);
|
|
|
|
*arg = (unsigned long)cl;
|
|
return 0;
|
|
}
|
|
|
|
static void drr_destroy_class(struct Qdisc *sch, struct drr_class *cl)
|
|
{
|
|
gen_kill_estimator(&cl->rate_est);
|
|
qdisc_put(cl->qdisc);
|
|
kfree(cl);
|
|
}
|
|
|
|
static int drr_delete_class(struct Qdisc *sch, unsigned long arg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
struct drr_class *cl = (struct drr_class *)arg;
|
|
|
|
if (cl->filter_cnt > 0)
|
|
return -EBUSY;
|
|
|
|
sch_tree_lock(sch);
|
|
|
|
qdisc_purge_queue(cl->qdisc);
|
|
qdisc_class_hash_remove(&q->clhash, &cl->common);
|
|
|
|
sch_tree_unlock(sch);
|
|
|
|
drr_destroy_class(sch, cl);
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long drr_search_class(struct Qdisc *sch, u32 classid)
|
|
{
|
|
return (unsigned long)drr_find_class(sch, classid);
|
|
}
|
|
|
|
static struct tcf_block *drr_tcf_block(struct Qdisc *sch, unsigned long cl,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
|
|
if (cl) {
|
|
NL_SET_ERR_MSG(extack, "DRR classid must be zero");
|
|
return NULL;
|
|
}
|
|
|
|
return q->block;
|
|
}
|
|
|
|
static unsigned long drr_bind_tcf(struct Qdisc *sch, unsigned long parent,
|
|
u32 classid)
|
|
{
|
|
struct drr_class *cl = drr_find_class(sch, classid);
|
|
|
|
if (cl != NULL)
|
|
cl->filter_cnt++;
|
|
|
|
return (unsigned long)cl;
|
|
}
|
|
|
|
static void drr_unbind_tcf(struct Qdisc *sch, unsigned long arg)
|
|
{
|
|
struct drr_class *cl = (struct drr_class *)arg;
|
|
|
|
cl->filter_cnt--;
|
|
}
|
|
|
|
static int drr_graft_class(struct Qdisc *sch, unsigned long arg,
|
|
struct Qdisc *new, struct Qdisc **old,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct drr_class *cl = (struct drr_class *)arg;
|
|
|
|
if (new == NULL) {
|
|
new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
|
|
cl->common.classid, NULL);
|
|
if (new == NULL)
|
|
new = &noop_qdisc;
|
|
}
|
|
|
|
*old = qdisc_replace(sch, new, &cl->qdisc);
|
|
return 0;
|
|
}
|
|
|
|
static struct Qdisc *drr_class_leaf(struct Qdisc *sch, unsigned long arg)
|
|
{
|
|
struct drr_class *cl = (struct drr_class *)arg;
|
|
|
|
return cl->qdisc;
|
|
}
|
|
|
|
static void drr_qlen_notify(struct Qdisc *csh, unsigned long arg)
|
|
{
|
|
struct drr_class *cl = (struct drr_class *)arg;
|
|
|
|
list_del(&cl->alist);
|
|
}
|
|
|
|
static int drr_dump_class(struct Qdisc *sch, unsigned long arg,
|
|
struct sk_buff *skb, struct tcmsg *tcm)
|
|
{
|
|
struct drr_class *cl = (struct drr_class *)arg;
|
|
struct nlattr *nest;
|
|
|
|
tcm->tcm_parent = TC_H_ROOT;
|
|
tcm->tcm_handle = cl->common.classid;
|
|
tcm->tcm_info = cl->qdisc->handle;
|
|
|
|
nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
if (nla_put_u32(skb, TCA_DRR_QUANTUM, cl->quantum))
|
|
goto nla_put_failure;
|
|
return nla_nest_end(skb, nest);
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int drr_dump_class_stats(struct Qdisc *sch, unsigned long arg,
|
|
struct gnet_dump *d)
|
|
{
|
|
struct drr_class *cl = (struct drr_class *)arg;
|
|
__u32 qlen = qdisc_qlen_sum(cl->qdisc);
|
|
struct Qdisc *cl_q = cl->qdisc;
|
|
struct tc_drr_stats xstats;
|
|
|
|
memset(&xstats, 0, sizeof(xstats));
|
|
if (qlen)
|
|
xstats.deficit = cl->deficit;
|
|
|
|
if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 ||
|
|
gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
|
|
gnet_stats_copy_queue(d, cl_q->cpu_qstats, &cl_q->qstats, qlen) < 0)
|
|
return -1;
|
|
|
|
return gnet_stats_copy_app(d, &xstats, sizeof(xstats));
|
|
}
|
|
|
|
static void drr_walk(struct Qdisc *sch, struct qdisc_walker *arg)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
struct drr_class *cl;
|
|
unsigned int i;
|
|
|
|
if (arg->stop)
|
|
return;
|
|
|
|
for (i = 0; i < q->clhash.hashsize; i++) {
|
|
hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
|
|
if (!tc_qdisc_stats_dump(sch, (unsigned long)cl, arg))
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch,
|
|
int *qerr)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
struct drr_class *cl;
|
|
struct tcf_result res;
|
|
struct tcf_proto *fl;
|
|
int result;
|
|
|
|
if (TC_H_MAJ(skb->priority ^ sch->handle) == 0) {
|
|
cl = drr_find_class(sch, skb->priority);
|
|
if (cl != NULL)
|
|
return cl;
|
|
}
|
|
|
|
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
|
|
fl = rcu_dereference_bh(q->filter_list);
|
|
result = tcf_classify(skb, NULL, fl, &res, false);
|
|
if (result >= 0) {
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
switch (result) {
|
|
case TC_ACT_QUEUED:
|
|
case TC_ACT_STOLEN:
|
|
case TC_ACT_TRAP:
|
|
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
|
|
fallthrough;
|
|
case TC_ACT_SHOT:
|
|
return NULL;
|
|
}
|
|
#endif
|
|
cl = (struct drr_class *)res.class;
|
|
if (cl == NULL)
|
|
cl = drr_find_class(sch, res.classid);
|
|
return cl;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int drr_enqueue(struct sk_buff *skb, struct Qdisc *sch,
|
|
struct sk_buff **to_free)
|
|
{
|
|
unsigned int len = qdisc_pkt_len(skb);
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
struct drr_class *cl;
|
|
int err = 0;
|
|
bool first;
|
|
|
|
cl = drr_classify(skb, sch, &err);
|
|
if (cl == NULL) {
|
|
if (err & __NET_XMIT_BYPASS)
|
|
qdisc_qstats_drop(sch);
|
|
__qdisc_drop(skb, to_free);
|
|
return err;
|
|
}
|
|
|
|
first = !cl->qdisc->q.qlen;
|
|
err = qdisc_enqueue(skb, cl->qdisc, to_free);
|
|
if (unlikely(err != NET_XMIT_SUCCESS)) {
|
|
if (net_xmit_drop_count(err)) {
|
|
cl->qstats.drops++;
|
|
qdisc_qstats_drop(sch);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
if (first) {
|
|
list_add_tail(&cl->alist, &q->active);
|
|
cl->deficit = cl->quantum;
|
|
}
|
|
|
|
sch->qstats.backlog += len;
|
|
sch->q.qlen++;
|
|
return err;
|
|
}
|
|
|
|
static struct sk_buff *drr_dequeue(struct Qdisc *sch)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
struct drr_class *cl;
|
|
struct sk_buff *skb;
|
|
unsigned int len;
|
|
|
|
if (list_empty(&q->active))
|
|
goto out;
|
|
while (1) {
|
|
cl = list_first_entry(&q->active, struct drr_class, alist);
|
|
skb = cl->qdisc->ops->peek(cl->qdisc);
|
|
if (skb == NULL) {
|
|
qdisc_warn_nonwc(__func__, cl->qdisc);
|
|
goto out;
|
|
}
|
|
|
|
len = qdisc_pkt_len(skb);
|
|
if (len <= cl->deficit) {
|
|
cl->deficit -= len;
|
|
skb = qdisc_dequeue_peeked(cl->qdisc);
|
|
if (unlikely(skb == NULL))
|
|
goto out;
|
|
if (cl->qdisc->q.qlen == 0)
|
|
list_del(&cl->alist);
|
|
|
|
bstats_update(&cl->bstats, skb);
|
|
qdisc_bstats_update(sch, skb);
|
|
qdisc_qstats_backlog_dec(sch, skb);
|
|
sch->q.qlen--;
|
|
return skb;
|
|
}
|
|
|
|
cl->deficit += cl->quantum;
|
|
list_move_tail(&cl->alist, &q->active);
|
|
}
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
static int drr_init_qdisc(struct Qdisc *sch, struct nlattr *opt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
int err;
|
|
|
|
err = tcf_block_get(&q->block, &q->filter_list, sch, extack);
|
|
if (err)
|
|
return err;
|
|
err = qdisc_class_hash_init(&q->clhash);
|
|
if (err < 0)
|
|
return err;
|
|
INIT_LIST_HEAD(&q->active);
|
|
return 0;
|
|
}
|
|
|
|
static void drr_reset_qdisc(struct Qdisc *sch)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
struct drr_class *cl;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < q->clhash.hashsize; i++) {
|
|
hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
|
|
if (cl->qdisc->q.qlen)
|
|
list_del(&cl->alist);
|
|
qdisc_reset(cl->qdisc);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void drr_destroy_qdisc(struct Qdisc *sch)
|
|
{
|
|
struct drr_sched *q = qdisc_priv(sch);
|
|
struct drr_class *cl;
|
|
struct hlist_node *next;
|
|
unsigned int i;
|
|
|
|
tcf_block_put(q->block);
|
|
|
|
for (i = 0; i < q->clhash.hashsize; i++) {
|
|
hlist_for_each_entry_safe(cl, next, &q->clhash.hash[i],
|
|
common.hnode)
|
|
drr_destroy_class(sch, cl);
|
|
}
|
|
qdisc_class_hash_destroy(&q->clhash);
|
|
}
|
|
|
|
static const struct Qdisc_class_ops drr_class_ops = {
|
|
.change = drr_change_class,
|
|
.delete = drr_delete_class,
|
|
.find = drr_search_class,
|
|
.tcf_block = drr_tcf_block,
|
|
.bind_tcf = drr_bind_tcf,
|
|
.unbind_tcf = drr_unbind_tcf,
|
|
.graft = drr_graft_class,
|
|
.leaf = drr_class_leaf,
|
|
.qlen_notify = drr_qlen_notify,
|
|
.dump = drr_dump_class,
|
|
.dump_stats = drr_dump_class_stats,
|
|
.walk = drr_walk,
|
|
};
|
|
|
|
static struct Qdisc_ops drr_qdisc_ops __read_mostly = {
|
|
.cl_ops = &drr_class_ops,
|
|
.id = "drr",
|
|
.priv_size = sizeof(struct drr_sched),
|
|
.enqueue = drr_enqueue,
|
|
.dequeue = drr_dequeue,
|
|
.peek = qdisc_peek_dequeued,
|
|
.init = drr_init_qdisc,
|
|
.reset = drr_reset_qdisc,
|
|
.destroy = drr_destroy_qdisc,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init drr_init(void)
|
|
{
|
|
return register_qdisc(&drr_qdisc_ops);
|
|
}
|
|
|
|
static void __exit drr_exit(void)
|
|
{
|
|
unregister_qdisc(&drr_qdisc_ops);
|
|
}
|
|
|
|
module_init(drr_init);
|
|
module_exit(drr_exit);
|
|
MODULE_LICENSE("GPL");
|