mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 18:30:06 +00:00
![Vlad Buslov](/assets/img/avatar_default.png)
Current implementation of qdisc_destroy() decrements Qdisc reference counter and only actually destroy Qdisc if reference counter value reached zero. Rename qdisc_destroy() to qdisc_put() in order for it to better describe the way in which this function currently implemented and used. Extract code that deallocates Qdisc into new private qdisc_destroy() function. It is intended to be shared between regular qdisc_put() and its unlocked version that is introduced in next patch in this series. Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
425 lines
9.3 KiB
C
425 lines
9.3 KiB
C
/*
|
|
* Copyright (c) 2008, Intel Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* Author: Alexander Duyck <alexander.h.duyck@intel.com>
|
|
*/
|
|
|
|
#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>
|
|
#include <net/pkt_cls.h>
|
|
|
|
struct multiq_sched_data {
|
|
u16 bands;
|
|
u16 max_bands;
|
|
u16 curband;
|
|
struct tcf_proto __rcu *filter_list;
|
|
struct tcf_block *block;
|
|
struct Qdisc **queues;
|
|
};
|
|
|
|
|
|
static struct Qdisc *
|
|
multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
u32 band;
|
|
struct tcf_result res;
|
|
struct tcf_proto *fl = rcu_dereference_bh(q->filter_list);
|
|
int err;
|
|
|
|
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
|
|
err = tcf_classify(skb, fl, &res, false);
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
switch (err) {
|
|
case TC_ACT_STOLEN:
|
|
case TC_ACT_QUEUED:
|
|
case TC_ACT_TRAP:
|
|
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
|
|
/* fall through */
|
|
case TC_ACT_SHOT:
|
|
return NULL;
|
|
}
|
|
#endif
|
|
band = skb_get_queue_mapping(skb);
|
|
|
|
if (band >= q->bands)
|
|
return q->queues[0];
|
|
|
|
return q->queues[band];
|
|
}
|
|
|
|
static int
|
|
multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch,
|
|
struct sk_buff **to_free)
|
|
{
|
|
struct Qdisc *qdisc;
|
|
int ret;
|
|
|
|
qdisc = multiq_classify(skb, sch, &ret);
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (qdisc == NULL) {
|
|
|
|
if (ret & __NET_XMIT_BYPASS)
|
|
qdisc_qstats_drop(sch);
|
|
__qdisc_drop(skb, to_free);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
ret = qdisc_enqueue(skb, qdisc, to_free);
|
|
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 *multiq_dequeue(struct Qdisc *sch)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
struct Qdisc *qdisc;
|
|
struct sk_buff *skb;
|
|
int band;
|
|
|
|
for (band = 0; band < q->bands; band++) {
|
|
/* cycle through bands to ensure fairness */
|
|
q->curband++;
|
|
if (q->curband >= q->bands)
|
|
q->curband = 0;
|
|
|
|
/* Check that target subqueue is available before
|
|
* pulling an skb to avoid head-of-line blocking.
|
|
*/
|
|
if (!netif_xmit_stopped(
|
|
netdev_get_tx_queue(qdisc_dev(sch), q->curband))) {
|
|
qdisc = q->queues[q->curband];
|
|
skb = qdisc->dequeue(qdisc);
|
|
if (skb) {
|
|
qdisc_bstats_update(sch, skb);
|
|
sch->q.qlen--;
|
|
return skb;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
|
|
}
|
|
|
|
static struct sk_buff *multiq_peek(struct Qdisc *sch)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
unsigned int curband = q->curband;
|
|
struct Qdisc *qdisc;
|
|
struct sk_buff *skb;
|
|
int band;
|
|
|
|
for (band = 0; band < q->bands; band++) {
|
|
/* cycle through bands to ensure fairness */
|
|
curband++;
|
|
if (curband >= q->bands)
|
|
curband = 0;
|
|
|
|
/* Check that target subqueue is available before
|
|
* pulling an skb to avoid head-of-line blocking.
|
|
*/
|
|
if (!netif_xmit_stopped(
|
|
netdev_get_tx_queue(qdisc_dev(sch), curband))) {
|
|
qdisc = q->queues[curband];
|
|
skb = qdisc->ops->peek(qdisc);
|
|
if (skb)
|
|
return skb;
|
|
}
|
|
}
|
|
return NULL;
|
|
|
|
}
|
|
|
|
static void
|
|
multiq_reset(struct Qdisc *sch)
|
|
{
|
|
u16 band;
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
|
|
for (band = 0; band < q->bands; band++)
|
|
qdisc_reset(q->queues[band]);
|
|
sch->q.qlen = 0;
|
|
q->curband = 0;
|
|
}
|
|
|
|
static void
|
|
multiq_destroy(struct Qdisc *sch)
|
|
{
|
|
int band;
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
|
|
tcf_block_put(q->block);
|
|
for (band = 0; band < q->bands; band++)
|
|
qdisc_put(q->queues[band]);
|
|
|
|
kfree(q->queues);
|
|
}
|
|
|
|
static int multiq_tune(struct Qdisc *sch, struct nlattr *opt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
struct tc_multiq_qopt *qopt;
|
|
int i;
|
|
|
|
if (!netif_is_multiqueue(qdisc_dev(sch)))
|
|
return -EOPNOTSUPP;
|
|
if (nla_len(opt) < sizeof(*qopt))
|
|
return -EINVAL;
|
|
|
|
qopt = nla_data(opt);
|
|
|
|
qopt->bands = qdisc_dev(sch)->real_num_tx_queues;
|
|
|
|
sch_tree_lock(sch);
|
|
q->bands = qopt->bands;
|
|
for (i = q->bands; i < q->max_bands; i++) {
|
|
if (q->queues[i] != &noop_qdisc) {
|
|
struct Qdisc *child = q->queues[i];
|
|
q->queues[i] = &noop_qdisc;
|
|
qdisc_tree_reduce_backlog(child, child->q.qlen,
|
|
child->qstats.backlog);
|
|
qdisc_put(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), extack);
|
|
if (child) {
|
|
sch_tree_lock(sch);
|
|
old = q->queues[i];
|
|
q->queues[i] = child;
|
|
if (child != &noop_qdisc)
|
|
qdisc_hash_add(child, true);
|
|
|
|
if (old != &noop_qdisc) {
|
|
qdisc_tree_reduce_backlog(old,
|
|
old->q.qlen,
|
|
old->qstats.backlog);
|
|
qdisc_put(old);
|
|
}
|
|
sch_tree_unlock(sch);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int multiq_init(struct Qdisc *sch, struct nlattr *opt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
int i, err;
|
|
|
|
q->queues = NULL;
|
|
|
|
if (!opt)
|
|
return -EINVAL;
|
|
|
|
err = tcf_block_get(&q->block, &q->filter_list, sch, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
q->max_bands = qdisc_dev(sch)->num_tx_queues;
|
|
|
|
q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL);
|
|
if (!q->queues)
|
|
return -ENOBUFS;
|
|
for (i = 0; i < q->max_bands; i++)
|
|
q->queues[i] = &noop_qdisc;
|
|
|
|
return multiq_tune(sch, opt, extack);
|
|
}
|
|
|
|
static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct tc_multiq_qopt opt;
|
|
|
|
opt.bands = q->bands;
|
|
opt.max_bands = q->max_bands;
|
|
|
|
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 multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
|
|
struct Qdisc **old, struct netlink_ext_ack *extack)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
unsigned long band = arg - 1;
|
|
|
|
if (new == NULL)
|
|
new = &noop_qdisc;
|
|
|
|
*old = qdisc_replace(sch, new, &q->queues[band]);
|
|
return 0;
|
|
}
|
|
|
|
static struct Qdisc *
|
|
multiq_leaf(struct Qdisc *sch, unsigned long arg)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
unsigned long band = arg - 1;
|
|
|
|
return q->queues[band];
|
|
}
|
|
|
|
static unsigned long multiq_find(struct Qdisc *sch, u32 classid)
|
|
{
|
|
struct multiq_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 multiq_bind(struct Qdisc *sch, unsigned long parent,
|
|
u32 classid)
|
|
{
|
|
return multiq_find(sch, classid);
|
|
}
|
|
|
|
|
|
static void multiq_unbind(struct Qdisc *q, unsigned long cl)
|
|
{
|
|
}
|
|
|
|
static int multiq_dump_class(struct Qdisc *sch, unsigned long cl,
|
|
struct sk_buff *skb, struct tcmsg *tcm)
|
|
{
|
|
struct multiq_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 multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
|
|
struct gnet_dump *d)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
struct Qdisc *cl_q;
|
|
|
|
cl_q = q->queues[cl - 1];
|
|
if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
|
|
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 multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
int band;
|
|
|
|
if (arg->stop)
|
|
return;
|
|
|
|
for (band = 0; band < q->bands; band++) {
|
|
if (arg->count < arg->skip) {
|
|
arg->count++;
|
|
continue;
|
|
}
|
|
if (arg->fn(sch, band + 1, arg) < 0) {
|
|
arg->stop = 1;
|
|
break;
|
|
}
|
|
arg->count++;
|
|
}
|
|
}
|
|
|
|
static struct tcf_block *multiq_tcf_block(struct Qdisc *sch, unsigned long cl,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct multiq_sched_data *q = qdisc_priv(sch);
|
|
|
|
if (cl)
|
|
return NULL;
|
|
return q->block;
|
|
}
|
|
|
|
static const struct Qdisc_class_ops multiq_class_ops = {
|
|
.graft = multiq_graft,
|
|
.leaf = multiq_leaf,
|
|
.find = multiq_find,
|
|
.walk = multiq_walk,
|
|
.tcf_block = multiq_tcf_block,
|
|
.bind_tcf = multiq_bind,
|
|
.unbind_tcf = multiq_unbind,
|
|
.dump = multiq_dump_class,
|
|
.dump_stats = multiq_dump_class_stats,
|
|
};
|
|
|
|
static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
|
|
.next = NULL,
|
|
.cl_ops = &multiq_class_ops,
|
|
.id = "multiq",
|
|
.priv_size = sizeof(struct multiq_sched_data),
|
|
.enqueue = multiq_enqueue,
|
|
.dequeue = multiq_dequeue,
|
|
.peek = multiq_peek,
|
|
.init = multiq_init,
|
|
.reset = multiq_reset,
|
|
.destroy = multiq_destroy,
|
|
.change = multiq_tune,
|
|
.dump = multiq_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init multiq_module_init(void)
|
|
{
|
|
return register_qdisc(&multiq_qdisc_ops);
|
|
}
|
|
|
|
static void __exit multiq_module_exit(void)
|
|
{
|
|
unregister_qdisc(&multiq_qdisc_ops);
|
|
}
|
|
|
|
module_init(multiq_module_init)
|
|
module_exit(multiq_module_exit)
|
|
|
|
MODULE_LICENSE("GPL");
|