linux_dsm_epyc7002/net/sched/sch_ingress.c
Jiri Pirko 6529eaba33 net: sched: introduce tcf block infractructure
Currently, the filter chains are direcly put into the private structures
of qdiscs. In order to be able to have multiple chains per qdisc and to
allow filter chains sharing among qdiscs, there is a need for common
object that would hold the chains. This introduces such object and calls
it "tcf_block".

Helpers to get and put the blocks are provided to be called from
individual qdisc code. Also, the original filter_list pointers are left
in qdisc privs to allow the entry into tcf_block processing without any
added overhead of possible multiple pointer dereference on fast path.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-17 15:22:13 -04:00

241 lines
5.1 KiB
C

/* net/sched/sch_ingress.c - Ingress and clsact qdisc
*
* 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: Jamal Hadi Salim 1999
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
struct ingress_sched_data {
struct tcf_block *block;
};
static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
{
return NULL;
}
static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
{
return TC_H_MIN(classid) + 1;
}
static bool ingress_cl_offload(u32 classid)
{
return true;
}
static unsigned long ingress_bind_filter(struct Qdisc *sch,
unsigned long parent, u32 classid)
{
return ingress_get(sch, classid);
}
static void ingress_put(struct Qdisc *sch, unsigned long cl)
{
}
static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
}
static struct tcf_block *ingress_tcf_block(struct Qdisc *sch, unsigned long cl)
{
struct ingress_sched_data *q = qdisc_priv(sch);
return q->block;
}
static int ingress_init(struct Qdisc *sch, struct nlattr *opt)
{
struct ingress_sched_data *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
int err;
err = tcf_block_get(&q->block, &dev->ingress_cl_list);
if (err)
return err;
net_inc_ingress_queue();
sch->flags |= TCQ_F_CPUSTATS;
return 0;
}
static void ingress_destroy(struct Qdisc *sch)
{
struct ingress_sched_data *q = qdisc_priv(sch);
tcf_block_put(q->block);
net_dec_ingress_queue();
}
static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
{
struct nlattr *nest;
nest = nla_nest_start(skb, TCA_OPTIONS);
if (nest == NULL)
goto nla_put_failure;
return nla_nest_end(skb, nest);
nla_put_failure:
nla_nest_cancel(skb, nest);
return -1;
}
static const struct Qdisc_class_ops ingress_class_ops = {
.leaf = ingress_leaf,
.get = ingress_get,
.put = ingress_put,
.walk = ingress_walk,
.tcf_block = ingress_tcf_block,
.tcf_cl_offload = ingress_cl_offload,
.bind_tcf = ingress_bind_filter,
.unbind_tcf = ingress_put,
};
static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
.cl_ops = &ingress_class_ops,
.id = "ingress",
.priv_size = sizeof(struct ingress_sched_data),
.init = ingress_init,
.destroy = ingress_destroy,
.dump = ingress_dump,
.owner = THIS_MODULE,
};
struct clsact_sched_data {
struct tcf_block *ingress_block;
struct tcf_block *egress_block;
};
static unsigned long clsact_get(struct Qdisc *sch, u32 classid)
{
switch (TC_H_MIN(classid)) {
case TC_H_MIN(TC_H_MIN_INGRESS):
case TC_H_MIN(TC_H_MIN_EGRESS):
return TC_H_MIN(classid);
default:
return 0;
}
}
static bool clsact_cl_offload(u32 classid)
{
return TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_INGRESS);
}
static unsigned long clsact_bind_filter(struct Qdisc *sch,
unsigned long parent, u32 classid)
{
return clsact_get(sch, classid);
}
static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl)
{
struct clsact_sched_data *q = qdisc_priv(sch);
switch (cl) {
case TC_H_MIN(TC_H_MIN_INGRESS):
return q->ingress_block;
case TC_H_MIN(TC_H_MIN_EGRESS):
return q->egress_block;
default:
return NULL;
}
}
static int clsact_init(struct Qdisc *sch, struct nlattr *opt)
{
struct clsact_sched_data *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
int err;
err = tcf_block_get(&q->ingress_block, &dev->ingress_cl_list);
if (err)
return err;
err = tcf_block_get(&q->egress_block, &dev->egress_cl_list);
if (err)
return err;
net_inc_ingress_queue();
net_inc_egress_queue();
sch->flags |= TCQ_F_CPUSTATS;
return 0;
}
static void clsact_destroy(struct Qdisc *sch)
{
struct clsact_sched_data *q = qdisc_priv(sch);
tcf_block_put(q->egress_block);
tcf_block_put(q->ingress_block);
net_dec_ingress_queue();
net_dec_egress_queue();
}
static const struct Qdisc_class_ops clsact_class_ops = {
.leaf = ingress_leaf,
.get = clsact_get,
.put = ingress_put,
.walk = ingress_walk,
.tcf_block = clsact_tcf_block,
.tcf_cl_offload = clsact_cl_offload,
.bind_tcf = clsact_bind_filter,
.unbind_tcf = ingress_put,
};
static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
.cl_ops = &clsact_class_ops,
.id = "clsact",
.priv_size = sizeof(struct clsact_sched_data),
.init = clsact_init,
.destroy = clsact_destroy,
.dump = ingress_dump,
.owner = THIS_MODULE,
};
static int __init ingress_module_init(void)
{
int ret;
ret = register_qdisc(&ingress_qdisc_ops);
if (!ret) {
ret = register_qdisc(&clsact_qdisc_ops);
if (ret)
unregister_qdisc(&ingress_qdisc_ops);
}
return ret;
}
static void __exit ingress_module_exit(void)
{
unregister_qdisc(&ingress_qdisc_ops);
unregister_qdisc(&clsact_qdisc_ops);
}
module_init(ingress_module_init);
module_exit(ingress_module_exit);
MODULE_ALIAS("sch_clsact");
MODULE_LICENSE("GPL");