Contributors: 22
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Tejun Heo |
427 |
40.17% |
24 |
37.50% |
| Neil Horman |
418 |
39.32% |
1 |
1.56% |
| Al Viro |
69 |
6.49% |
3 |
4.69% |
| John Fastabend |
53 |
4.99% |
3 |
4.69% |
| Linus Torvalds (pre-git) |
20 |
1.88% |
10 |
15.62% |
| Srivatsa S. Bhat |
17 |
1.60% |
1 |
1.56% |
| Gao Feng |
13 |
1.22% |
2 |
3.12% |
| Joe Perches |
12 |
1.13% |
3 |
4.69% |
| Eric Dumazet |
6 |
0.56% |
3 |
4.69% |
| Paul Menage |
5 |
0.47% |
1 |
1.56% |
| Aristeu Sergio Rozanski Filho |
3 |
0.28% |
1 |
1.56% |
| Ingo Molnar |
3 |
0.28% |
1 |
1.56% |
| Russell King |
3 |
0.28% |
1 |
1.56% |
| Jiri Pirko |
3 |
0.28% |
1 |
1.56% |
| Stephen Hemminger |
2 |
0.19% |
2 |
3.12% |
| Thomas Gleixner |
2 |
0.19% |
1 |
1.56% |
| Eric W. Biedermann |
2 |
0.19% |
1 |
1.56% |
| Christoph Lameter |
1 |
0.09% |
1 |
1.56% |
| Linus Torvalds |
1 |
0.09% |
1 |
1.56% |
| Daniel Wagner |
1 |
0.09% |
1 |
1.56% |
| Benjamin LaHaise |
1 |
0.09% |
1 |
1.56% |
| Ben Hutchings |
1 |
0.09% |
1 |
1.56% |
| Total |
1063 |
|
64 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* net/core/netprio_cgroup.c Priority Control Group
*
* Authors: Neil Horman <nhorman@tuxdriver.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/cgroup.h>
#include <linux/rcupdate.h>
#include <linux/atomic.h>
#include <linux/sched/task.h>
#include <net/rtnetlink.h>
#include <net/pkt_cls.h>
#include <net/sock.h>
#include <net/netprio_cgroup.h>
#include <linux/fdtable.h>
/*
* netprio allocates per-net_device priomap array which is indexed by
* css->id. Limiting css ID to 16bits doesn't lose anything.
*/
#define NETPRIO_ID_MAX USHRT_MAX
#define PRIOMAP_MIN_SZ 128
/*
* Extend @dev->priomap so that it's large enough to accommodate
* @target_idx. @dev->priomap.priomap_len > @target_idx after successful
* return. Must be called under rtnl lock.
*/
static int extend_netdev_table(struct net_device *dev, u32 target_idx)
{
struct netprio_map *old, *new;
size_t new_sz, new_len;
/* is the existing priomap large enough? */
old = rtnl_dereference(dev->priomap);
if (old && old->priomap_len > target_idx)
return 0;
/*
* Determine the new size. Let's keep it power-of-two. We start
* from PRIOMAP_MIN_SZ and double it until it's large enough to
* accommodate @target_idx.
*/
new_sz = PRIOMAP_MIN_SZ;
while (true) {
new_len = (new_sz - offsetof(struct netprio_map, priomap)) /
sizeof(new->priomap[0]);
if (new_len > target_idx)
break;
new_sz *= 2;
/* overflowed? */
if (WARN_ON(new_sz < PRIOMAP_MIN_SZ))
return -ENOSPC;
}
/* allocate & copy */
new = kzalloc(new_sz, GFP_KERNEL);
if (!new)
return -ENOMEM;
if (old)
memcpy(new->priomap, old->priomap,
old->priomap_len * sizeof(old->priomap[0]));
new->priomap_len = new_len;
/* install the new priomap */
rcu_assign_pointer(dev->priomap, new);
if (old)
kfree_rcu(old, rcu);
return 0;
}
/**
* netprio_prio - return the effective netprio of a cgroup-net_device pair
* @css: css part of the target pair
* @dev: net_device part of the target pair
*
* Should be called under RCU read or rtnl lock.
*/
static u32 netprio_prio(struct cgroup_subsys_state *css, struct net_device *dev)
{
struct netprio_map *map = rcu_dereference_rtnl(dev->priomap);
int id = css->id;
if (map && id < map->priomap_len)
return map->priomap[id];
return 0;
}
/**
* netprio_set_prio - set netprio on a cgroup-net_device pair
* @css: css part of the target pair
* @dev: net_device part of the target pair
* @prio: prio to set
*
* Set netprio to @prio on @css-@dev pair. Should be called under rtnl
* lock and may fail under memory pressure for non-zero @prio.
*/
static int netprio_set_prio(struct cgroup_subsys_state *css,
struct net_device *dev, u32 prio)
{
struct netprio_map *map;
int id = css->id;
int ret;
/* avoid extending priomap for zero writes */
map = rtnl_dereference(dev->priomap);
if (!prio && (!map || map->priomap_len <= id))
return 0;
ret = extend_netdev_table(dev, id);
if (ret)
return ret;
map = rtnl_dereference(dev->priomap);
map->priomap[id] = prio;
return 0;
}
static struct cgroup_subsys_state *
cgrp_css_alloc(struct cgroup_subsys_state *parent_css)
{
struct cgroup_subsys_state *css;
css = kzalloc(sizeof(*css), GFP_KERNEL);
if (!css)
return ERR_PTR(-ENOMEM);
return css;
}
static int cgrp_css_online(struct cgroup_subsys_state *css)
{
struct cgroup_subsys_state *parent_css = css->parent;
struct net_device *dev;
int ret = 0;
if (css->id > NETPRIO_ID_MAX)
return -ENOSPC;
if (!parent_css)
return 0;
rtnl_lock();
/*
* Inherit prios from the parent. As all prios are set during
* onlining, there is no need to clear them on offline.
*/
for_each_netdev(&init_net, dev) {
u32 prio = netprio_prio(parent_css, dev);
ret = netprio_set_prio(css, dev, prio);
if (ret)
break;
}
rtnl_unlock();
return ret;
}
static void cgrp_css_free(struct cgroup_subsys_state *css)
{
kfree(css);
}
static u64 read_prioidx(struct cgroup_subsys_state *css, struct cftype *cft)
{
return css->id;
}
static int read_priomap(struct seq_file *sf, void *v)
{
struct net_device *dev;
rcu_read_lock();
for_each_netdev_rcu(&init_net, dev)
seq_printf(sf, "%s %u\n", dev->name,
netprio_prio(seq_css(sf), dev));
rcu_read_unlock();
return 0;
}
static ssize_t write_priomap(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
char devname[IFNAMSIZ + 1];
struct net_device *dev;
u32 prio;
int ret;
if (sscanf(buf, "%"__stringify(IFNAMSIZ)"s %u", devname, &prio) != 2)
return -EINVAL;
dev = dev_get_by_name(&init_net, devname);
if (!dev)
return -ENODEV;
rtnl_lock();
ret = netprio_set_prio(of_css(of), dev, prio);
rtnl_unlock();
dev_put(dev);
return ret ?: nbytes;
}
static int update_netprio(const void *v, struct file *file, unsigned n)
{
struct socket *sock = sock_from_file(file);
if (sock)
sock_cgroup_set_prioidx(&sock->sk->sk_cgrp_data,
(unsigned long)v);
return 0;
}
static void net_prio_attach(struct cgroup_taskset *tset)
{
struct task_struct *p;
struct cgroup_subsys_state *css;
cgroup_taskset_for_each(p, css, tset) {
void *v = (void *)(unsigned long)css->id;
task_lock(p);
iterate_fd(p->files, 0, update_netprio, v);
task_unlock(p);
}
}
static struct cftype ss_files[] = {
{
.name = "prioidx",
.read_u64 = read_prioidx,
},
{
.name = "ifpriomap",
.seq_show = read_priomap,
.write = write_priomap,
},
{ } /* terminate */
};
struct cgroup_subsys net_prio_cgrp_subsys = {
.css_alloc = cgrp_css_alloc,
.css_online = cgrp_css_online,
.css_free = cgrp_css_free,
.attach = net_prio_attach,
.legacy_cftypes = ss_files,
};
static int netprio_device_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct netprio_map *old;
/*
* Note this is called with rtnl_lock held so we have update side
* protection on our rcu assignments
*/
switch (event) {
case NETDEV_UNREGISTER:
old = rtnl_dereference(dev->priomap);
RCU_INIT_POINTER(dev->priomap, NULL);
if (old)
kfree_rcu(old, rcu);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block netprio_device_notifier = {
.notifier_call = netprio_device_event
};
static int __init init_cgroup_netprio(void)
{
register_netdevice_notifier(&netprio_device_notifier);
return 0;
}
subsys_initcall(init_cgroup_netprio);