mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 14:46:39 +07:00
c6e970a04b
There is an include loop between netdevice.h, dsa.h, devlink.h because of NETDEV_ALIGN, making it impossible to use devlink structures in dsa.h. Break this loop by taking dsa.h out of netdevice.h, add a forward declaration of dsa_switch_tree and netdev_set_default_ethtool_ops() function, which is what netdevice.h requires. No longer having dsa.h in netdevice.h means the includes in dsa.h no longer get included. This breaks a few other files which depend on these includes. Add these directly in the affected file. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
308 lines
6.9 KiB
C
308 lines
6.9 KiB
C
/*
|
|
* net/core/netprio_cgroup.c Priority Control Group
|
|
*
|
|
* 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: 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/module.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->cgroup->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->cgroup->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->cgroup->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;
|
|
|
|
cgroup_sk_alloc_disable();
|
|
|
|
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)
|
|
{
|
|
int err;
|
|
struct socket *sock = sock_from_file(file, &err);
|
|
if (sock) {
|
|
spin_lock(&cgroup_sk_update_lock);
|
|
sock_cgroup_set_prioidx(&sock->sk->sk_cgrp_data,
|
|
(unsigned long)v);
|
|
spin_unlock(&cgroup_sk_update_lock);
|
|
}
|
|
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->cgroup->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);
|
|
MODULE_LICENSE("GPL v2");
|